Final answer:
Sperm production typically is reduced with age, although factors like environmental elements can also impact sperm quality and quantity.
Step-by-step explanation:
The question focuses on the topic of sperm production and how it is affected by age and other factors. The correct answer to this question is: C) Is reduced with age. Sperm production usually continues until death, but after age 35, there is a decline in the number and quality of sperm cells. Factors such as environmental elements, body temperature, and nutrition can affect semen quality and quantity. Moreover, hormones like testosterone also decrease with age in a process known as andropause, impacting the characteristics of spermatozoa to some extent.