Which words in the sentence make up the adverb phrase? Which words do the adverb phrase modify?

The blue shark can swim up to 25 miles per hour through the water.

A.
up to 25 miles per hour; modifies through the water

B.
through the water; modifies can swim

C.
can swim; modifies The blue shark

D.
through the water; modifies 25 miles per hour