binoculars goggles a microscope a hand lens
I gave my students this multiple choice question: A student wants to find out how many different kinds of birds are found in a park. In addition to a bird identification book, the student should use ___.

Only one answer is correct among these 4 choices:
- binoculars
- goggles
- a microscope
- a hand lens

Could you tell me which one is correct?

binoculars