In deciding _______ a course of action,the candidates tried to estimate its likely impact on the voters.[A] what to pursue [B] which to pursue [C] whether to pursue [D] if to pursue为什么选C?请翻译句子

In deciding _______ a course of action,the candidates tried to estimate its likely impact on the voters.[A] what to pursue [B] which to pursue [C] whether to pursue [D] if to pursue为什么选C?请翻译句子
In deciding _______ a course of action,the candidates tried to estimate its likely impact on the voters.[A] what to pursue [B] which to pursue [C] whether to pursue [D] if to pursue
为什么选C?请翻译句子

In deciding _______ a course of action,the candidates tried to estimate its likely impact on the voters.[A] what to pursue [B] which to pursue [C] whether to pursue [D] if to pursue为什么选C?请翻译句子
句子翻译：
在决定是否要推行一系列举措的时候,候选人试着估测此举可能对选民们造成的影响.
A项释义：推行什么
B项释义：推行哪个
C项释义：是否推行
D项释义：如果要推行
显然,C选项符合原句所要表达的意思.
并且,就语法而言,A、B选项和a course of action无法搭配；D选项if to pursue这种说法本身就怪异.

为了决定是否实践一个行动计划。候选者尝试估量这么做会对投票者有什么样的影响。
决定是否做XXX所以不是AB,一般在decide,dicuss一类做选择的动词之后用whether不用if