please rate my awa and let me know the errors :)

The following appeared in an article in a health and fitness magazine. “a recent study of balding men revealed that 80%had higher than normal levels of the chemical compound DHT in their bodies. A second study discovered that rats fed a diet high in animal fats produced elevated levels of the same...

can anyone tell me how to approach this question in less than 2min because I took around 10minutes to solve and get to the answer.
An approach for all cr questions in general.
Thankyou