Well,let’s put our heads together and find (an answer?) to t

Well,let’s put our heads together and find (an answer?) to the problem.
Well,let’s put our heads together and find () to the problem.
选项:
a、a.an answer
b、 b.a way
c、 c.a solution
d、 d.a method
搞不清楚答案为什么是这个呀，能不能提醒一下？