The answer to the question is c
I would answer the question but there are no answer choices, so if you could add that maybe I could help! :)
At θ = 90°, the equation must evaluate to zero. The only one that does that is the 1st choice ...
r = 2 - 2sin(θ)
Answer:

Step-by-step explanation:
Looks like all you have to do it multiply the numbers together; there is no application of the Distributive Property to these problems.