Final answer:
Because of meiosis, sperm cells contain A) 23 chromosomes, making them haploid, so they can combine with an egg to form a diploid zygote.
Step-by-step explanation:
Regular human body cells are considered diploid because they contain two sets of chromosomes, one set from each parent, for a total of 46 chromosomes.
However, during the process of meiosis, the number of chromosomes is halved. Therefore, because of meiosis, sperm cells contain A) 23 chromosomes.
This is because gametes, which include sperm and egg cells, are haploid, each having one set of chromosomes so that when they unite during fertilization, they can form a diploid zygote with the correct number of chromosomes.