If only men are allowed to apply for a job what does it show?

Correct answer: Gender discrimination

The direct answer is A: gender discrimination. A job should normally be open to qualified applicants according to relevant skills, education, and genuine job requirements. If men alone are allowed to apply simply because they are men, women are denied the same opportunity without a fair ability-based reason. The reasoning is: the rule separates applicants by sex; sex is being used instead of competence; equal access is therefore removed; this is discrimination. Option A is correct. Option B is wrong because equal opportunity means qualified people of different genders can compete fairly, not that only men may apply. Option C is wrong because age suitability concerns whether someone is old enough or otherwise suitable by age, not whether the person is male or female. Option D is wrong because safety training is instruction for safe work and does not justify excluding an entire gender. A restriction can sometimes be examined under a specific lawful and genuine job requirement, but the wording here presents a general exclusion of men or women. The exam cue is: unequal access based only on gender is gender discrimination.