请教大全190

1.        By showing that South Africa does not have a free market and is in fact a kind of collectivist welfare state for Whites only, Sowell argues that American conservatives have no valid ideological grounds to be in sympathy with the Pretoria regime.

(A) to be in sympathy with

(B) to sympathize with

(C) for sympathizing with

(D) that they should sympathize with（C）

(E) that they should have sympathy for

我选了B,而且longman上有have grounds to do something的用法,为什么答案是C呢