instant (lin-stənt] noun 1. a brief period of time 2. a particular point in time adjective designed for fast preparation. From Old French via Latin instāre, approach. Which sentence uses the word instant correctly? O A. In the first instant in the textbook, you can see that the formula is incorrect O B. At the instant I thought of my grandmother, the phone rang. C. At the instant of his teacher, he tried out for the math squad. O D. It was yet another instant of how he failed to listen carefully.​