The amount troy charges to mow a lawn is proportional to the time it takes him to mow the lawn. troy charges $30 to mow a lawn that took him 1.5 hours to mow

which equation models the amount in dollars, (D) troy charges when it takes him (H) hours to mow a lawn

A. d= 20h
B. h=20d
C. d=45h
D. h=45d