No. C is not correct.
A prepositional phrase begins with a preposition and ends with a noun or pronoun.
Check this list of prepositions to see which is the prepositional phrase.
http://www.englishclub.com/grammar/prepositions-list.htm
identify the prepositional pharse. vouluntary muscles, which help you move are joined to your bones. ) to your bones C)are joined to your bones d) are joined i think its c.
3 answers
is it a.
I don't see "a" as a possible answer above.