A public health officer reported that 60 % of the children

A public health officer reported that 60 % of the children at summer school have never had the measles or chicken pox and that of this 60 %
not one child has ever been observed to eat the cheese served in the
school lunches. From this he concluded that children who abstain
from cheese products will protect themselves from most childhood diseases.

Each of the following , if true, would strenghthen the official's argument except:

a) medically speaking , whatever serves to inhibit measles and chicken pox will generally inhibit the entire spectrum of childhood diseases.

b) the observations the official carried out were extremely accurate and all those observed to abstain from cheese at school did, in fact, abstain.

c)the children's eating habits are the same at school as anywhere lese and those who abstain from cheese products at school do so in general.

d) recent research has pointed to a deficiency in cheese products as one of the major causes of measles and chicken pox infections.

e) most cheeses and cheese products harbor bacteria that are known to be causative agents for many childhood diseases, such as measles and chicken pox.