[Solved] The variability of sexual urges and interests is called A) the sexual response cycle. B) sexual orientation. C) the refractory period. D) erotic plasticity. Fifteen Hours: A specific duration of time, amounting to fifteen hours, often used to quantify tasks or activities. Lower Grades: Refers to academic scores that fall below the expected or standard level, often indicating a need for improvement or additional support. Borrowing: The act of receiving something with the intention to return it or its equivalent. Registrar: An official in an academic institution responsible for maintaining student records, scheduling classes, and managing enrollments and graduations.