This Table Contains Data on the Social Costs and Benefits

Multiple Choice

This table contains data on the social costs and benefits incurred in improving water quality in a lake.Complete the table and answer the question(s) below.
Table 9.1-Costs of reducing water pollution
-In Table 9.1,what is the marginal social cost (in dollars per PPM) of reducing pollution rates from 35 to 25 PPM?

A) $1
B) $5
C) $7
D) $10