Assertion (A) : Teacher should encourage boys of her class to participate in sports while assigning art decoration to girls.

Reason (R) : Children acquire gender roles primarily because of the underlying biological differences.

Choose the correct option.

The correct option is Both (A) and (R) are false.

1. Analysis of Assertion (A):
Assertion (A) states: "Teacher should encourage boys of her class to participate in sports while assigning art decoration to girls."
This statement promotes gender stereotyping by suggesting that physical activities like sports are only for boys and creative/domestic activities like art decoration are only for girls. A teacher should encourage inclusive participation regardless of gender to promote equal opportunities for all students. Therefore, Assertion (A) is false.

2. Analysis of Reason (R):
Reason (R) states: "Children acquire gender roles primarily because of the underlying biological differences."
Gender roles are social and cultural constructs acquired through socialization, environment, culture, and societal expectations (gender socialization), rather than being primarily determined by underlying biological differences (sex). Biological differences determine sex, not gender roles. Therefore, Reason (R) is also false.

Conclusion:
Since both Assertion (A) and Reason (R) are incorrect statements, the correct choice is that both (A) and (R) are false.