Heather's interest and gains on investments for the current year are as follows: $600 Interest on Madison County school bonds Interest on U.S. government bonds 700 Interest on a Federal income tax refund 200 Gain on the sale of Madison County school bonds 500 Heather must report gross income in the amount of: Oa. $2,000. Ob. $1,400. Oc. c. $1,800. Od. $1,300