The given graph shows the levels of the different hormones during the period of ovulation. During the phase of the ovulation, the hormones level increase. This increase in the levels of the hormones prepare the uterus for the fertilization of the egg. The uterine line is thickened. This is the phase when the LH (Luteinizing hormone) surge occurs, which refers to the sudden increase in the levels of LH. Moreover, the levels of FH, estradiol, and progesterone are also increased at different rates during ovulation.
Hence, the correct answer is 'option A - The hormone levels increase to prepare a woman's body to receive fertilized egg'.