单选题 What is said about the over 100 aircraft incidents in the past 15 years?

A、 They may have been caused by the damage to the radio systems.
B、 They may have taken place during take-off and landing.
C、 They were proved to have been caused by the passengers' portable computers.
D、 They were suspected to have resulted from electromagnetic interferenc

【正确答案】 D

【答案解析】参见文章第一段第二至第三行。