Answer:
The answer is C
Step-by-step explanation:
I think C because the question stated, "A library is buying books at a constant rate of 150 books per year." This cancels out all other options.
A said that they are purchasing 7,000 books per year. They were actually purchasing 150 books per year.
B said that they were purchasing 150 books per month. 150 x 12 = 1,800, which meant that at this rate, 1,800 books would be bought per year. That is not true with what the question says.
D said that they were purchasing 7,000 books per month. It is not possible for the library to buy more books per month than per year.
This is why I think the answer is C.
P.S. I am writing long responses because I want to get marked braniest, so please mark this as brainest :)