Critical Reasoning

Source: OG Verbal Review 2nd Edition

In response to viral infection, the immune systems of mice typically produce antibodies that destroy the virus by binding to proteins on its surface. Mice infected with a herpesvirus generally develop keratitis, a degenerative disease affecting part of the eye. Since proteins on the surface of cells in this part of the eye closely resemble those on the herpesvirus surface, scientists hypothesize that these cases of keratitis are caused by antibodies to herpesvirus.

Which of the following, if true, gives the greatest additional support to the scientists' hypothesis?

A. Other types of virus have surface proteins that closely resemble proteins found in various organs of mice.

B. There are mice that are unable to form antibodies in response to herpes infections, and these mice contract herpes at roughly the same rate as other mice.

C. Mice that are infected with a herpesvirus but do not develop keratitis produce as many antibodies as infected mice that do develop keratitis.

D. There are mice that are unable to form antibodies in response to herpes infections, and these mice survive these infections without ever developing keratitis.

E. Mice that have never been infected with a herpesvirus can sometimes develop keratitis.

IMO D

Pattern :
X causes Y. To strengthen it, we can say No X..Then No Y.

X : Formation of Antibodies
Y: Devlopment of Disease

IMO "D"

I think D is correct; by establishing that there keratitis doesn't happen in mice without the antibodies, this choice strengthens the causal connection between the antibodies and keratitis.

Thanks to everyone for help

Here, main thing is that
Keratitis are developed by antibodies in response to herpes-virus infection.

P1: antibodies => binding proteins of virus's surface
P2: Herpesvirus (a kind of virus) causes =>keratitis (a kind of disease of the eye when its proteins was bidden)
P3: Herpesvirus surface = eye's surface.
C: antibodies => biding eye's proteins.

Strengthen:
D: no antibodies => no binding eye's proteins => no keratitis.
Hence, antibodies do cause binding's eye's proteins and thereby cause keratitis.

My ... cents!