(A) The Amazon River is about 4,000 miles long and goes through three countries: Peru, Brazil, and Colombia
This is the correct answer assuming the image is a landscape of the Amazon River. It would be the best because it gives the very basic information about the river. The other captions would be best as additional facts about the river especially if they were paired with an image that matches. Option B should be with a picture o fa bull shark. Option C should be an image of the Mangrove trees in the swamps next to the river. Option D could be with an image of the flooded river or the river in a rainstorm.