Spellings

Catamaran is the correct spelling of this word referring to a type of boat with two parallel hulls. Options A, B, and C all contain spelling errors with incorrect letter placement or duplication.

Tomorrow is the correct spelling with single 'm' and double 'r'. Options A and B are missing letters, while D has the wrong double letter pattern (double 'm' instead of double 'r').

Hippopotamus is the correct spelling with double 'p' at the start and single 'p' in the middle. Options A and D incorrectly place the double letters, while C uses an incorrect ending (mes instead of mus).

Embarrass is the correct spelling with double 'r' and double 's'. Options B and C are missing letters or have incorrect duplication, while D has only one 'r' and one 's'.

When adding suffixes like '-able' to words ending in silent 'e', most words keep the 'e' (changeable, lovable, likeable). 'Hopeing' drops the 'e' before '-ing' (hoping), 'argueable' drops the 'e' before '-able' (arguable), and 'haveing' drops the 'e' before '-ing' (having). Only 'changeable' correctly keeps the 'e' before the suffix.

'Crucial' is the correct spelling - it means extremely important or decisive. 'Crutial', 'Cruciel', and 'Crutiel' are misspelled variants mixing letters incorrectly.

'Prudential' is the correct spelling meaning relating to prudence or wisdom. 'Prudencial', 'Prudensial', and 'Prudentcial' incorrectly substitute letters or add extra syllables.

'Meticulous' is correctly spelled - it means showing great attention to detail. 'Metriculous', 'Meticulos', and 'Metticulous' are incorrect variations.

'Assassination' is the correct spelling with double 's' in both syllables (as-sas-sin-a-tion). 'Assasination' (only one double-s), 'Asassination', and 'Assasinasion' are incorrect.

'Crucible' is the correct spelling - a vessel used for melting at high temperatures, metaphorically a severe test. 'Crucibel', 'Crocible', and 'Croucible' are misspelled.

'Embarrassment' is correctly spelled with double 'r' and double 's' (em-bar-rass-ment). 'Embarasment', 'Embarrasment', and 'Embarassment' miss one or both doubled letters.

'Achievement' is the correct spelling with 'ie' after 'ach'. 'achievment', 'acheivement', and 'achivement' are incorrect.

'Psychiatrist' is the correct spelling (a medical doctor specializing in mental health). 'Psyciatist', 'Psychiatist', and 'Psyciatrist' are misspelled.

'Unimpeachable' is correctly spelled meaning completely reliable or unquestionable. 'Unimpeasable' is missing 'ch', 'unimpeachablilty' is an incorrect noun form, and 'None of these' is wrong since A is correct.

Psychological is the correct spelling. It starts with the Greek root 'psycho-' (mind) which includes a silent 'p'. The 'g' produces the 'j' sound before the 'i'.