To solve this problem, we need to identify which structure secretes the hormone relaxin during the later phase of pregnancy. Let's analyze each option:$\newline \bullet$Option 1: Graafian follicle$\newline$ - The Graafian follicle is a mature ovarian follicle that releases an egg during ovulation.$\newline$ - It primarily secretes estrogen and does not secrete relaxin.$\newline \bullet$Option 2: Corpus luteum$\newline$ - The corpus luteum is formed from the remnants of the Graafian follicle after ovulation.$\newline$ - It secretes progesterone and relaxin during pregnancy.$\newline$ - Relaxin helps in the relaxation of the pelvic ligaments and cervix during the later stages of pregnancy.$\newline$ - Therefore, the corpus luteum is responsible for secreting relaxin.$\newline \bullet$Option 3: Foetus$\newline$ - The foetus does not secrete relaxin.$\newline \bullet$Option 4: Uterus$\newline$ - The uterus does not secrete relaxin.$\newline$Based on the analysis, the correct answer is Option 2: Corpus luteum.