Read the two sections of the passage.

1) the halftime performers whirled through a complex series of choreographed moves. 2) twirling their batons so fast they resembled helicopter blades.

which option explains why section 2 is a sentence fragment?

it begins with a coordinating conjunction and therefore must be linked with an independent clause or main sentence.

it begins with participle verb form and therefore must be linked with an independent clause or main sentence.

it does not contain a noun.

it does not contain a verb.