Final answer:
Granzymes are proteases released by cytotoxic T cells that induce apoptosis in target cells by entering through pores created by perforin(option b).
Step-by-step explanation:
The enzymes released by cytotoxic T cells that attack proteins in target cells during the process called apoptosis are known as granzymes.
Granzymes are a type of protease that enters target cells through pores formed by perforin and induces apoptosis in those cells. This process is utilized not only by cytotoxic T cells but also by NK cells in the immune system to control infections and prevent cancer progression.Therefore, the correct answer is B. Proteases.