Which choice completes the text so that it conforms to the conventions of Standard English?

Question

The museum ____ open on Mondays, so plan your visit for another day.

Accepted Answer

A. isn't. 'isn't' is the contraction of 'is not'; the apostrophe replaces the missing 'o'.

Answer

B. isnt — 'isnt' lacks the apostrophe that marks the omitted letter.

Answer

C. is'nt — The apostrophe goes where the letter is missing — between 'n' and 't', not before 'n'.

Answer

D. isn't, — A comma after 'isn't' splits the verb from 'open'.

Standard English Conventions practice question