Directions: In the question, there are four sentences. Each sentence has a pair of words/phrases marked as ‘A’ and ‘B’ that are italicised or highlighted. Select the most appropriate word or phrase in each case to form grammatically and syntactically correct sentences. Then, from the options that follow, choose the correct one.
(i) A line was drawn perpendicular from the (A) vertex (B) vortex of the equilateral triangle to the base to divide the triangle into two equal parts. (ii) The chief manager of the bank visited many branches of the bank on an (A) official (B) officious visit. (iii) The (A) observance (B) observation of moral laws should be the first duty of a gentleman. (iv) A (A) monetary (B) monitory notice was served on him to mend his ways, failing which, a legal action would be taken against him.