A continuous and differentiable function \( y=f(x) \) is such that its graph cuts line \( y=m x+...

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A continuous and differentiable function \( y=f(x) \) is such that its graph cuts line \( y=m x+c \) at \( n \) distinct points. Then the minimum number of points at which \( f^{\prime \prime}(x)=0 \) is/are
(A) \( n-1 \)
(B) \( n-3 \)
(C) \( n-2 \)
(D) cannot say
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