Explanation:

- Red Blood Cells (A) are responsible for transporting oxygen. The hemoglobin in them binds to oxygen and carries it to body tissues.

- Matched with Function 4.

- White Blood Cells (B) function to fight infection. They are part of the immune system and help to defend the body against pathogens.

- Matched with Function 2.

- Platelets (C) help blood to clot. They gather at a wound site and help in the formation of clots to prevent bleeding.

- Matched with Function 1.

- Plasma (D) is the carrier of dissolved substances. It transports nutrients, hormones, and waste products throughout the body.

- Matched with Function 3.

Therefore, the correct matching of the functions is:

- A - 4

- B - 2

- C - 1

- D - 3

- Correct Option: 4 - 4, 2, 1, 3