15) D

A – Wrong
The text does not specify whether the increases and decrease in proteins has a negative effect on human health. So A is wrong.

B – Wrong
The first and second lines do say that radiation from mobile phones are not strong enough (low level) but may affect cell behaviour. So we cannot say that there is negligible reaction.

C – Wrong
We cannot deduce this just from the fact that cell behavior is affected. We do not know whether the changes in cell behavior is harmful or not. So we cannot conclude that people should keep conversations to less than an hour or not.

D – Correct
The first and second lines do say that radiation from mobile phones are not strong enough (low level) but may affect cell behaviour.

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