Correct option is B
The Kachwaha Rajput house of Amber (modern-day Jaipur) was the first Rajput family to form a matrimonial alliance with Emperor Akbar. In 1562, Akbar married the daughter of Raja Bharmal of Amber, who became known as Mariam-uz-Zamani. This alliance was crucial in securing Rajput support for Akbar and marked the beginning of several similar alliances between the Mughals and Rajputs.
Rathore (a): This Rajput clan ruled over Marwar, but they established relations with Akbar later.
Chauhan (c) and Sisodiya (d): These Rajput clans were slower to form alliances with the Mughals.