What led to the development of a similar school of painting in Mankot as that of Basohli?

Marital relations between Basohli and Mankot.

The correct answer is option 3 - Marital relations between Basohli and Mankot.

Due to marital relations between Basohli and Mankot, few artists from Basohli seem to have shifted to Mankot, thereby, developing a similar school of painting. While Jasrota had an indulgent patron in Balwant Singh and the school is well-known through his numerous portraits painted by his court artist, Nainsukh, who led the earlier simple Basohli style to new sophistication. This style of Nainsukh is also referred to as the Guler–Kangra style. Rulers of Mandi were ardent worshippers of Vishnu and Shiva. Hence, apart from the Krishna Lila themes, Shaivite subjects were also painted. An artist named Molaram is associated with the Garhwal School. Several signed paintings by him have been discovered. This school was influenced by the Kangra style of Sansar Chand phase.