OG详解-OG2 数学2 Q4

Choice D is correct. Because the graph of  y = f (x) is shown, the value of  f(0) is the value of y  on the graph that corresponds with x = 0. When x = 0, the corresponding value of y  is  3. Therefore, the value of f(0) is 3.
Choice A is incorrect and may result from conceptual errors. Choice B is incorrect and may result from conceptual errors. Choice C is incorrect and may result from  conceptual errors.