Which of the Following Is Most Likely to Be an Agreement

Which of the following is most likely to be an agreement that lessens competition in breach of CCA Part IV?

A) The only two pencil manufacturers in Australia agree to help each other maintain their respective shares of the pencil market.
B) The only two eraser manufacturers in Australia agree to cooperate to conduct research into new eraser technology.
C) The only two pen manufacturers in Australia agree to jointly set up a factory in China.
D) The only two ruler manufacturers in Australia agree to manufacture plastic rulers instead of wooden rulers.