Which country would you visit if you wanted to see inca ruins?

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!

8. is a technique that uses the images from several telescopes to produce a single image. a. reflection b. interferometry c. radiation d. refraction

Which of the following is the main purpose of using an anchored network of booms which funnel debris to a collection area?