Recall that Tommy Twit's mother measures the departure of any bundle from her

favorite bundle for Tommy by the sum of the absolute values of the differences. Her

favorite bundle for Tommy is (2, 7), that is, 2 cookies and 7 glasses of milk. Tommy's
mother's indifference curve that passes through the point (c, m) = (5, 4) also passes

through

a. the points (5, 7), (2, 4), and (2, 10).

b. the points (2, 1), (8, 7), and (5, 10).

c. the point (8, 1).

d. the point (2, 7).

e. None of the above.

刚学微观，这道作业题没看懂。。请问怎么思考？