Radon is formed by the breakdown of the ozone layer may cause lung cancer when inhaled binds with hemoglobin, preventing binding with oxygen contributes to the breakdown of the ozone layer in the atmosphere limits the availability of sunlight for plants

Radon may cause lung cancer when inhaled.
a: is formed by the breakdown of the ozone layer
b: may cause lung cancer when inhaled
c: binds with hemoglobin, preventing binding with oxygen
d: contributes to the breakdown of the ozone layer
e: in the atmosphere limits the availability of sunlight for plants