What is the frequency of availment for maternity and paternity leave?

The frequency of availment for maternity and paternity leave being described as "No limit; first four pregnancies of the lawful wife" aligns with various national laws that govern maternity leave specifically in relation to the pregnancies of legally recognized spouses. This means a mother can take maternity leave for each of her pregnancies without restriction, while the father can avail himself of paternity leave for the first four pregnancies of his legal spouse.

This arrangement acknowledges the unique needs of families as they grow, allowing for adequate parental leave during crucial bonding and recovery periods associated with childbirth. The structuring of leave in this way encourages responsible parenting while setting clear limits on the paternity side, which reflects common practices in many jurisdictions to manage parental leave benefits effectively.

The other options do not capture the legal framework associated with maternity and paternity leave accurately. They allude to various restrictions and limits that are inconsistent with many policies that promote parental involvement during each pregnancy. Therefore, option B best describes the specific parameters within which maternity and paternity leave can be availed.