C. It would be steeper
A. is wrong because think of rise/run (1/2)! the rise needs to be bigger than the run to become less steep.
B. is wrong because the +1 has not changed! if that changed then the slope would be shifted.
C. is right because the original slope was 2/1 so you would go UP 2 then LEFT 1. For the changed one, go UP 1 and LEFT 2.
D. is wrong because it can only move left or right if you add value to the x variable.