I would have to go with (D) sorry if it’s wrong.
Sperm cell is haploid - it has half the number of chromosomes.
I believe it’s D. It’s not A because when you use your muscles you’re getting micro tears that repair and grow.
Vitamin A deficiency is the leading cause of preventable blindness in children and increases the risk of disease and death from severe infections such as diarrhoeal disease and measles.