Read the following thesis and counter-argument from an essay:
THESIS: Cell phones may cause brain cancer. COUNTER-ARGUMENT: Medical research has not yet proven a connection between brain cancer and cell phone use.
Which of the following is the most relevant rebuttal to the counter -argument?
A. Cell phones are not a necessity, so people could learn to moderate use in case their health is at risk.
B. Medical research usually takes a long time before it proves anything.
C. Even though they cannot prove the case for cancer yet, is being glued to a radioactive device 24 hours a day really smart?
D. While not enough time has passed for conclusive evidence to prove this , many studies have indicated that there's a likely risk.