Which of the following choices is a comma splice? a. beetles have mouthparts that are similar to those of grasshoppers. b. these mouthparts are called the mandibles, they are jaw-like structures beetles use for crushing food or defending themselves. c. the antennae of the beetles are used not only to smell but also to feel out their environment. d. the antennae vary greatly among beetles; for some, the antennae are used for self defense.

Comma splices are compound sentences that are not punctuated properly. It occurs when a comma is used between two independent clauses. This creates a problem since a comma alone cannot be used to separate two independent clauses.

The sentence that contains a comma splice is option B:

These mouthparts are called the mandibles they are jaw-like structures beetles use for crushing food or defending themselves.

it seems your test or quiz or whatever it is i would most be happy to you so it seem's here it's talking about justice if i could possible make it up but for you quiz or test i just did some research it would most likely be a. and for a couple of reasons. for the points i really needed them : )