The Slope of a Graph with "Income" on the Horizontal

Multiple Choice

The slope of a graph with "income" on the horizontal axis and "saving" on the vertical axis is +0.2. This means that if

A) income is $100, then saving is $20.
B) income is 0.20, then saving is zero.
C) income increases by $100, then saving will rise by $20.
D) saving rises by $100, then income will rise by $20.