A national scheme to reduce infant mortality rate (IMR) and promote institutional deliveries by providing cash incentives is:

Correct option is A

Janani Suraksha Yojana (2005) provides conditional cash transfer to promote institutional deliveries and reduce maternal & infant mortality.
Explanation of options: (a) ✔ Correct; JSY incentivizes pregnant women to deliver in health institutions. (b) ✘ RBSK focuses on early child health screening, not delivery. (c) ✘ PMSMA gives free antenatal check-ups, not cash incentives for delivery. (d) ✘ Mission Indradhanush is for immunization, not delivery promotion.