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

Question

After three days of steady ____ the river finally dropped below the flood line.

Accepted Answer

A. rain,. An introductory phrase is followed by a comma.

Answer

B. rain — No comma runs the phrase into the clause.

Answer

C. rain; — A semicolon can't follow a phrase.

Answer

D. rain, and — 'And' leaves no main clause before it.

Standard English Conventions practice question