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

Question

The ferry runs hourly in ____ in winter it runs only twice a day.

Accepted Answer

A. summer, but. Two independent clauses joined by "but" take a comma before the conjunction.

Answer

B. summer but — Without the comma, two independent clauses are joined by a bare conjunction.

Answer

C. summer; but — A semicolon and a coordinating conjunction together is nonstandard.

Answer

D. summer, however — "however" is not a conjunction, so this is a comma splice.

Standard English Conventions practice question