takes or costs

[jasonlulu_2000]

Don't get discouraged. Learning a new language ________ a lot of effort.
A. costs B. takes

The answer given is B, which I fully accept. But is Answer A definitely wrong?

Since "Building this school costs a lot of time" is right, WHY couldn't I say "something costs a lot of effort?

Thanks for your help!

Jason

[Barb_D]

It's absolutely wrong in a multiple choice test and the other sentence about the school, while it might have been written, is very unnatural.