What are sacred groves and their role in biodiversity conservation ?

Habitat loss and fragmentation, over exploitation, alien species invasion and co-extinction are causes for

$A$ : Pristine forests are among in-situ conservation strategies.

$R$ : These are sacred grooves where biota is protected on-site

How many countries pledged their commitment to achieve by $2010$, a significant reduction in the current rate of biodiversity loss at global, regional and local levels in the World Summit held in $2002$?

In the following in each set a conservation approach and an example of method of conservation are given
($a$) In situ conservation - Biosphere Reserve
($b$) Ex situ conservation - Sacred groves
($c$) In situ conservation - Seed bank
($d$) Ex situ conservation - Cryopreservation
Select the option with correct match of approach and method

Sacred groves are specially useful in