Final answer:
In sexual reproduction, sex cells contain half of the total genetic information, and are formed through meiosis. Therefore, the correct option is c.
Step-by-step explanation:
In sexual reproduction, sex cells, or gametes, are formed through a process known as meiosis. During meiosis, the DNA is replicated and the number of chromosomes is reduced by half so that when fertilization occurs, the resultant zygote will have the correct number of chromosomes. Thus, the correct answer to the student's question is that sex cells contain half of the total genetic information. Hence, the correct option is C. half of the total genetic information.