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 the 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 the herpesvirus. Which of the following, if true, most helps to support the scientists' reasoning? ['Mice that are infected with the herpesvirus but do not develop keratitis produce as many antibodies as infected mice that do develop keratitis', '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', 'Other types of virus have surface proteins that closely resemble proteins found in various organs of mice.', 'Mice infected With a new strain of the herpesvirus that has different surface proteins did not develop keratitis']