Given that y = f (x + 1) is an even function, then the symmetry axis of the image of the function y = f (x) is () A. x=2B. x=-2C. x=1D. x=-1

Given that y = f (x + 1) is an even function, then the symmetry axis of the image of the function y = f (x) is () A. x=2B. x=-2C. x=1D. x=-1


Because y = f (x + 1) is an even function, the image of y = f (x + 1) is symmetric about the Y axis, and the image of y = f (x) can be obtained by moving y = f (x + 1) to the right by one unit, so the image of y = f (x) is symmetric about x = 1, so C is selected