Final answer:
The cells that leave the thymus with the ability to bind to class I major histocompatibility (MHC) molecules will develop into cytotoxic T cells.
Step-by-step explanation:
The cells that leave the thymus and are able to bind to class I major histocompatibility (MHC) molecules will develop into cytotoxic T cells (A). These cells play a role in killing infected cells and tumor cells. CD8+ T cells, which bind to class I MHC molecules, are part of the cytotoxic T cell population.