Researchers in England reveal that the rate of sudden unexplained deaths in the

country is around eight times higher than previously thought. The study published in

Heart - the subsidiary publication of the Briti sh Medical Joumal shows that around

500 people may die every year from Sudden Arrhythmic Death Syndrome (SADS).

It could also be attributable to________________ . SADS is characterized by

severe abnormalities in heart rhythm. If a person dies from SADS, his or her family

members should be screened to prevent more deaths.

(a) epilepsy and drowning

(b) families not agreeing to examination

(c) deaths being misclassified

(d) a genetic heart defect

여기서 답이 d인데요 근거가 무엇일까요? 딱히 genetic이라는것을 유추할 만한것이 없는데

그리고 저는 마지막 문장의 screen을 격리하다, 가리다 라고 해석했더니 답을 찾을 수 없었어요ㅜㅜㅜ

답지를 보니까 screen이 검사하다 더라구요ㅠㅠㅠ

자꾸 이런 오답이 나오게 되는데 어떻게 고치는 것이 좋을ㄲ요?ㅜㅜㅜ