Which of the following gender biased actions are not to be involved in…

Educational-equity frameworks treat "gender bias" as any policy, grouping, or teacher behaviour that produces differential treatment on the basis of gender — for example, segregating students by gender, steering them toward gender-typed occupations, or holding prejudiced expectations of them. The universally recommended corrective response is the opposite of bias: content and pedagogy that is deliberately gender-neutral, so a bias-free classroom removes the biased practices while it keeps gender-neutral material — the two sit on opposite sides of the same ledger, not the same side.

Checking each listed action against this principle:

• Homogeneous grouping — arranging students into single-gender groups reinforces separation along gender lines, so it counts as a biased practice that should not be used.

• Gender-neutral content — presenting material free of gender stereotyping is the recommended remedy for bias, not an instance of it, so it should be retained rather than avoided.

• Stereotyped occupation guidance — steering students toward "typically male" or "typically female" careers is a textbook case of gender-biased guidance and should not be used.

• Teacher's prejudiced attitude — a teacher holding differential expectations of students based on their gender is itself a form of bias in practice and should not be used.

The set that is exclusive here is the one that removes homogeneous grouping, stereotyped guidance, and a prejudiced attitude while keeping gender-neutral content in classroom practice — every rival combination either drops one of the three genuine biases or wrongly discards the corrective, gender-neutral content.

Hence the practices that must not be part of educational practice are homogeneous grouping, stereotyped occupation guidance, and the teacher's prejudiced attitude — i.e. (a), (c) and (d).