Which will most likely cause an increase in the frequency of genetic mutations in humans?
А
increased exposure to mold spores in the air
B
increased exposure to the rising levels of atmospheric CO2
с
increased exposure to bacteria in drinking water
D
increased exposure to X-rays

Increased exposure to X-rays

Explanation:

X-rays shoot harmful radiation through your body, that's why when you go to the dentist or other places and they take a X-ray they give you a lead vest to protect your organs from unneeded radiation.

hope this helps :)  

the answer to you question is   jet streams