To solve this problem, we need to understand how the GnRH pulse frequency in females is regulated.$\newline$GnRH, or Gonadotropin-releasing hormone, is crucial for the regulation of the reproductive system.$\newline$The frequency and amplitude of GnRH pulses are influenced by various hormones.$\newline \bullet$Estrogen:$\newline$ - Estrogen levels fluctuate during the menstrual cycle and have a significant impact on GnRH pulse frequency.$\newline$ - High levels of estrogen can increase the frequency of GnRH pulses.$\newline \bullet$Progesterone:$\newline$ - Progesterone is another key hormone that affects GnRH pulse frequency.$\newline$ - It generally acts to decrease the frequency of GnRH pulses.$\newline$Therefore, the changes in GnRH pulse frequency in females are controlled by the circulating levels of both estrogen and progesterone.$\newline$This corresponds to Option 1: Estrogen and progesterone.