The correct answer is option 'B', the seminal vesicles.

The seminal vesicles are male accessory glands located behind the bladder. They play a crucial role in the production of seminal fluid, which is essential for the nourishment and transportation of sperm.

Here is a detailed explanation of why the seminal vesicles are responsible for generating fluid rich in fructose, calcium, and enzymes that nourish sperm:

1. Anatomy and location of the seminal vesicles:
- The seminal vesicles are a pair of elongated, sac-like structures located above the prostate gland.
- They are connected to the vas deferens, a tube that carries sperm from the testes to the urethra during ejaculation.

2. Secretion of seminal fluid:
- The seminal vesicles produce a significant portion of the fluid that makes up semen.
- This fluid constitutes about 60-70% of the total volume of semen.
- It is alkaline in nature, helping to neutralize the acidic environment of the urethra and the female reproductive tract.

3. Composition of seminal fluid:
- The seminal fluid secreted by the seminal vesicles contains various substances that are crucial for the nourishment and viability of sperm.
- Fructose: It provides an energy source for sperm motility and metabolism.
- Calcium: It plays a role in sperm activation and helps in the process of fertilization.
- Enzymes: The seminal vesicles secrete enzymes like fibrinogenase and proteolytic enzymes that help in the liquefaction of semen and facilitate the movement of sperm.

4. Function of seminal fluid:
- The fluid produced by the seminal vesicles helps in the transportation of sperm.
- It provides a medium for the movement of sperm through the male reproductive system.
- The fructose present in seminal fluid provides energy for sperm motility.
- Calcium ions are involved in the activation of sperm, enabling them to swim towards the egg.
- Enzymes present in seminal fluid aid in the breakdown of proteins and the liquefaction of semen, which is necessary for the release of sperm during ejaculation.

In conclusion, the seminal vesicles are responsible for generating seminal fluid that is rich in fructose, calcium, and enzymes. This fluid plays a vital role in nourishing, activating, and transporting sperm during ejaculation.

The seminal vesicles are responsible for generating fluid rich in fructose, calcium, and certain enzymes. This fluid, known as seminal plasma, nourishes the sperm and constitutes the majority of the volume of semen. It provides important nutrients to support sperm function.