Which one of the following events is correctly matched with the time period in a normal menstrul cycle

Cessation of menstrual cycle in the human female is known as

$A$ : Corpus luteum begins to atrophy after a short life of $10 \;to \;14$ days, if fertilisation does not occur.
$R$ : Luteolysis may be due to withdrawal of $LH$ support

Corpus luteum is developed from

Corpus luteum in pregnancy has a long life. However, if fertilisation does not take place, it remains active only for $10-12$ days. Explain.