10. As it is used in the highlighted phrase, the word observe most nearly means:

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

Here we examine the familiar meanings of observe. Verbs must be chosen according to the object. The object of observe in the context is formality, which means "obey" here, and the same usage such as observe the law, observe the rules. This meaning must be remembered, it is a point that ACT and SAT often examine.