Final answer:
The a) seminal vesicles provide nourishment and the majority of fluid for sperm to form semen.
Step-by-step explanation:
The gland that provides nourishment for sperm, as well as the majority of the fluid that combines with sperm to form semen, is the seminal vesicles. These are accessory glands associated with the male reproductive system that secrete a fluid rich in nutrients, electrolytes, and pH buffers. The seminal vesicles make up about 70 percent of semen, which contains substances that sperm need to survive and swim in the female reproductive tract.