单选题 Why is it difficult to predict the possible effects of electromagnetic fields on an airplane's computers? ______.

A、 Because it is extremely dangerous to conduct such research on an airplane.
B、 Because it remains a mystery what wavelengths are liable to be interfered with.
C、 Because research scientists have not been to produce the same effects in labs.
D、 Because experts lack adequate equipment to do such research.

【正确答案】 C

【答案解析】依据是第三段第四行。