Which statement is correct?

A comma is needed in this sentence before the word "because" to separate the dependent clause from the independent clause.
The phrase "on her project" should be separated from the rest of the sentence by commas on both sides.
The dependent clause follows the independent clause in this sentence, so no comma is needed.
This is a compound sentence made up of two independent clauses, so no comma is needed.

Cooperation among oligopolies runs counter to the public interest because it leads to underproduction and high prices. in an effort to bring resource allocation closer to the social optimum, public officials attempt to force oligopolies to compete instead of cooperating. consider the following scenario: suppose that the presidents of two auto manufacturing companies exchange text messages in which they discuss jointly raising prices on their new lines of hybrid suvs. this illegal communication would violate which of the following laws? the sherman antitrust act of 1890 the robinson–patman act of 1936 the celler–kefauver act of 1950 the clayton act of 1914