At the primary school stage, most of the teachers should be women because they

Concept: A teacher's suitability for a particular stage of schooling is judged by the developmental needs of the learners at that stage. In the primary years (roughly ages 6 to 11) the child is still building attachment and emotional security, and that security is the pre-condition on which early learning rests. At this stage the teacher's affective role — warmth, patience, care — carries more pedagogical weight than advanced subject mastery, while cost of employment and blanket claims about ability are not educational grounds at all.

Application: The stem asks for the educationally defensible reason for preferring women teachers at the primary stage. Applying the principle, the acceptable ground is the affective one: that such teachers can deal with children with love and affection, which meets the young child's need for emotional security and makes the classroom a safe place to learn in.

Cross-check — why the other grounds do not hold:

• "can teach children better than men" — a blanket claim of superior instructional ability tied to gender. Teaching competence is produced by teacher education, training and reflective practice, so it cannot be asserted of one sex as a class.

• "know basic content better than men" — primary-level content is common to every trained teacher and is covered by the same teacher-education curriculum; mastery of it is not gender-linked.

• "are available on lower salaries" — an administrative cost argument. It violates the principle of equal pay for equal work and says nothing about what the child needs in order to learn.

Result: the sustainable reason is the affective one — women teachers are preferred at the primary stage because they can deal with children with love and affection. Note that this states a developmental need of the young child; it is not a claim that men are incapable of affection or of teaching young children well.