Which choice shows the correct placement of dashes? A. The—marching band—which has been practicing for weeks won a blue ribbon at the competition. B. The marching band—which has been—practicing for weeks won a blue ribbon at the competition. C. The marching band—which has been practicing for weeks—won a blue ribbon at the competition. D. The marching band which—has been practicing for weeks—won a blue ribbon at the competition.

C. The marching band—which has been practicing for weeks—won a blue ribbon at the competition

Explanation:

This is the correct placement of the dashes.

This is because the dash should only highlight the main object of the sentence which is

"which has been practicing for weeks" to make it clearer to the reader.

The main object of the sentence asks the question WHAT?

The main subject of the sentence answers the question WHO?

WHAT has the marching band been doing?

They have been practising for weeks

WHO has been practising for weeks?

The marching band.

to and without are prepositions, so a, b, and d are prepositional phrases. the adverb phrase is c, about the surprise.

explanation: