The Table Below Shows the Monthly Income of a Family

The table below shows the monthly income of a family and the fuel assistance received from the government. Table 19.4
Refer to Table 19.4.What is the marginal penalty on working (in terms of reduced fuel assistance) borne by the family when its income rises from $200 to $300?

A) $40
B) $50
C) $80
D) $60
E) $100