It's A. All you have to remember here are your rules of translations. If there is side to side movement within a parabola it will be indicated within a set of parenthesis with the x coordinate. If there is no set of parenthesis with the x there is no side to side movement. The quantity 
tells us that the vertex has moved left 3 units.
Find the distance between the points (2, 3) and (2, 8).
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Distance
|a+bi| is the length of the vector from origin to (a,b).
|a+bi| is the length of the vector from origin to (a,b).