Why is the bond angle in a water molecule less than the bond angle of methane

The H—C—H bond angle in methane is the tetrahedral angle, 109.5°. This angle is obtained when all four pairs of outer electrons repel each other equally. The bond angles in ammonia and in water are less than 109.5° because of the stronger repulsion by their lone pairs of electrons.

Explanation:

hope it helps!

the answer is b. dilution

answer7,570,82356 cubic centimeters;