Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
Overeating is a cause of several deadly diseases. Physical inactivity is another cause of several deadly diseases.
A. Not only overeating but also physical inactivity may lead to several deadly diseases.
B. Apart from physical activities, eating too much also contributes to several deadly diseases.
C. Both overeating and physical inactivity result from several deadly diseases.
D. Overeating and physical inactivity are caused by several deadly diseases.