This link should be much helpful to your question and provide more than what you are asking to https://infogr.am/alexgrey_1398868104
I think it's D. Adalya and Declan
The answer is D . pay attention to important deposit dates for apex students it is C .
The difference is in a mono there is only one so there is no competion and they control everything. and in a oligopoly is it is a small group of a few and there is little of none completion they work together. <span />
