Exposure to even small amounts of radiation may cause

a. dna changes

b. hearing loss

c. emphysema

d. asthma

Depending on the magnitude of radiation, the effects of exposure vary too. In this case, it is assumed that the small amount of radiation here has a very high radioactivity, then definitely it can cause DNA changes. In any way, it is rare that radiation affects the lining of the lungs and can cause illnesses such as emphysema and asthma. answer is A.