Explanation:

Let’s break this down district by district:

- Option 1: Sikar and Dholpur

Both these districts barely have any Scheduled Tribe (ST) population. In Sikar and Dholpur, it’s less than 1% of their total population—that’s tiny by any measure.

- Option 2: Jhunjhunu and Churu

These also have very low ST percentages, but slightly higher than Sikar and Dholpur—not the lowest.

- Option 3: Bikaner and Nagaur

Admittedly, their ST numbers are also quite low—hovering around the 1% mark, but still, Sikar and Dholpur edge them out for the very bottom.

- Option 4: Ganganagar and Hanumangarh

These two have low ST populations, but again, not as low as Sikar and Dholpur.

So, here’s what this really means:

Option 1: Sikar and Dholpur have the lowest percentage of Scheduled Tribe population in Rajasthan according to the 2011 Census.