An Independent Variable with 6 Values (Groups)can Be Used with a the T-Test,but

An independent variable with 6 values (groups) can be used with a the t-test,but you would have to make several ?t-tests.Of the various problems below,which is the one reflected by making multiple t-tests?

A) you would have an experiment-wise error rate problem
B) the groups would present a normal-distribution problem
C) there is no way to choose correctly which t-test you should use
D) there is no problem with making multiple t-tests as long as you meet other assumptions