Because cellular telephones emit signals that can interfere

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A

B

C

D

E

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Because cellular telephones emit signals that can interfere with cockpit-to-control-tower transmissions, airplane passengers' use of these instruments at all times that the airplane is in motion, even while on the ground, are prohibited.

(A) at all times that the airplane is in motion, even while on the ground, are

(B) at all times during which the airplane, even while on the ground, is in motion, are

(C) during airplane motion, even when it is on the ground, are

(D) during times of the airplane being in motion, even on the ground, is

(E) when the airplane is in motion, even while on the ground, is

OA E

Source: Princeton Review