Bob Lives in a Residential Neighbourhood That Takes Pride on Well-Groomed

Multiple Choice

Bob lives in a residential neighbourhood that takes pride on well-groomed lawns.Bob's neighbours find that the marginal benefit of someone else's well-groomed lawn is $10.Bob,however,receives the same net benefit from an unkempt lawn as a well-groomed lawn: zero (an unkempt lawn looks bad but costs nothing;a well groomed lawn looks nice but is costly) .
-Refer to the information above.The largest whole number of dollars Bob's neighbours would pay him to keep a well groomed lawn is

A) $1.
B) $2.
C) $5.
D) $9.
E) $20.