The nutritive medium for the ejaculated sperms is given by

The correct option is seminal fluid.

During ejaculation, sperms are transported along with secretions from various accessory glands of the male reproductive system. Collectively, these secretions and the sperms form semen. The non-cellular portion of semen is known as seminal fluid.
Seminal fluid is primarily produced by the seminal vesicles, the prostate gland, and the bulbourethral glands. It serves several crucial functions to ensure the viability and motility of sperms:

1. Nutritive Support: The seminal vesicles secrete a fluid rich in fructose, a simple sugar. Since sperms have a long journey to travel and need to swim actively, they require a constant and readily available source of energy. Fructose present in the seminal fluid acts as the primary nutrient source, fueling the mitochondria in the sperm's midpiece to produce ATP for flagellar movement.
2. Chemical Protection: The vaginal environment is naturally acidic, which is hostile to sperms. Seminal fluid is alkaline in nature, helping to neutralize the acidic environment of the male urethra and the female vagina, thereby protecting the sperms from damage.
3. Medium for Transport: It provides a liquid medium that allows the sperms to swim freely and reach the female reproductive tract.

Other options such as the fallopian tube, vaginal fluid, and uterine lining are parts or secretions of the female reproductive system that the sperm encounters later, but they do not function as the primary nutritive medium provided during ejaculation.