The correct option is C High level of hCG
Placenta also acts as an endocrine tissue and produces several hormones like human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogens, progestogens, relaxin, etc. hCG, hPL and relaxin are produced in women only during pregnancy. FSH, LH, oxytocin and prolactin are present in a non-pregnant female too.