Some employees have raised doubts about the manager’s impartiality in

Some employees have raised doubts about the manager’s impartiality in awarding performance ratings. He was discovered to be biased towards female employees than towards male employees. But the record shows that he has given a rating of 4 or higher (upon 5) to 80% of the male employees under him while giving such ratings to only 65% of the female employees. This clearly shows that the manager has not discriminated against male employees during performance appraisal.

The argument above is flawed in that it ignores the possibility that

A. A large number of the employees whom the manager evaluated were male.
B. Many managers find it difficult to be objective when awarding ratings to employees since they always have a personal bias/favorites.
C. The manager is more biased against male employees who complained to HR department than the ones who did not.
D. The partiality against male employees that the manger is accused of has been of male employees who did not get good ratings last year.
E. A greater percent of male employees deserved to get 4+ ratings, while a smaller percent female employees should have got such ratings, than the final numbers.