It is a step graph with slope of 2.
Answer: C
Whenever you are unsure, choose a coordinate, plug it into the equation, and see if it makes a true statement.
I choose (1/2, 1) → 1 = [2(1/2)] → 1 = [1] TRUE
I choose (1, 2) → 2 = [2(1)] → 2 = [2] TRUE
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