Economics homework help

Suppose consumption increases by $100m, all of which is spent on imports. Thinking in terms of the expenditure approach to calculate GDP, then GDP will:(a)Decrease by $100m.(b)Decrease by more than $100m.(c)Increase by $100m.(d)Increase by more than $100m.(e)Be unchangedIm not sure if its a , be or e . Can you please give me the correct answer and provide explanation and working out please