Is cigarette smoking injurious to health ?
I. Non-smokers have a longer life-span.
II. the incidence of heart attacks is more in smokers.

A

if the data in statement I alone are sufficient to answer the question;

B

if the data either in I or II alone are sufficient to answer the question;

C

if the data even in both the statement together are not sufficient to answer the question;

D

if the data in both the statements I and II are needed to answer the question.