Around 1900, fishermen in the Chesapeake Bay area landed more than seventeen million pounds of shad in a single year, but by 1920, overfishing and the proliferation of milldams and culverts that have blocked shad migrations up their spawning streams had reduced landings to less than four million pounds.

Around 1900, fishermen in the Chesapeake Bay area landed more than seventeen million pounds of shad in a single year, but by 1920, overfishing and the proliferation of milldams and culverts that have blocked shad migrations up their spawning streams had reduced landings to less than four million pounds.

A. that have blocked shad migrations up their spawning streams had reduced landings to less

B. that blocked shad from migrating up their spawning streams had reduced landings to less

C. that blocked shad from migrating up their spawning streams reduced landings to a lower amount

D. having blocked shad from migrating up their spawning streams reduced landings to less

E. having blocked shad migrations up their spawning streams had reduced landings to an amount lower

Correct Answer Below (so you don’t see it while reviewing the question)

Correct Answer: B

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