Multiple choice general knowledge math & puzzles

Which of the following is an open sentence?

  1. A trapezoid is a four-sided polygon

  2. Albany is a city in New York State.

  3. It was blue with white stripes.

  4. 5(20)+3=113

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An open sentence is a statement containing a variable (like 'It' or 'x') that can be true or false depending on what the variable represents. 'It was blue...' is open because 'It' is an undefined pronoun. The other options are closed statements with specific truth values.