So by pre-planning the time you want to______, you should be able to decide the gender of your baby, or in theory anyway.
【正确答案】 C
【答案解析】解析：solicit“恳求，征求”；perceive“意识到，察觉，发觉”；conceive“怀孕，构思”；investigate“调查，审查”。根据句意可知，此处应该是说提前计划怀孕的时间，只有C符合句意，故选C。