Answer:
C. a problem
Step-by-step explanation:
The name Petrarchan Sonnet comes from the fact that it was a man named Petrarchan who created this structure. The Petrarchan sonnet is divided in two parts: one is called the "octave" (of 8 lines) and the other "sestet" (of 6 lines), for a total of 14 lines. It is in the octave that a problem or theme is typically introduced.