Adirect environmental benefit resulting from the chesapeake bay action plan was
a. the partnership among states that share land around the bay
b. goals to limit the impact of dangerous compounds entering the watershed of the bay
c. a 60% increase in the population of blue crabs in one year
d. the state governor’s goals for their individual waterfronts
e. the money saved by reducing the amount of nitrogen and phosphorous compounds by agricultural sources

c. a 60% increase in the population of blue crabs in one year

Explanation:

The Chesapeake Bay had been suffering from decades of overuse and lack of watercare, however a group of senior concerned citizens united in turn of the many ailments that were troubling the bay and decided write up a plan regarding the possible solutions that were to take place if there were to be a remedy to improve the water quality.

The largest estuary in the US, as it is described, would undergo a series of steps that would need the attention of the three states related to it, Maryland, Virginia and Pennsylvania.  This is why none of the other responses like a partnership of the states, or goals to limit the impact of dangerous compounds, or the governor´s goals for waterfronts, or anything related to money saved reducing Ni and phosphorous compounds answer directly to an environmental benefit. These are goals or actions, not direct benefits.