65.

Answer and Explanation

Your Answer is

Correct Answer is B

Explanation

Here we want to express the density of cranes.

Item B: The concentration "density" is correct. English interpretation: a large amount of something in a particular place or among particular people.

A item: heap (messy) a bunch of things, the semantics do not match.

Item C: A string of bunches, none of which match the semantics.

Item D: The supply supply does not match the semantics.