Question

while italy has many rivers, they tend to be short. at four hundred miles, the po is the longest. south america, on the other hand has many long rivers. the amazon, south americas longest river, is 3,500 miles longer than the po.
the structure of the selection above can best be described as
a. compare and contrast.
b. sequence
c. definition.
d. cause and effect.

Explanation:

The passage presents information about rivers in Italy (short, with Po as longest at 400 miles) and rivers in South America (long, with Amazon being 3500 miles longer than Po). It highlights the differences (and some comparison) between the rivers of these two regions. "Compare and contrast" structure involves showing similarities and differences between two or more subjects, which matches here. "Sequence" is about order of events, "definition" explains what something is, and "cause and effect" shows a cause - result relationship, none of which apply here.

Answer:

A. compare and contrast