Finish the brave roommate's sentence as he offers his latest culinary invention.

"Would you care to try one of _____?" asked Leo, proudly holding out a tray of cupcakes that smelled faintly of garlic and despair.

The correct answer is these.

"These" acts as a pronoun here, referring to plural items that are physically close to the speaker (the cupcakes on the tray he is currently holding).