Correct option is D
Given:
Satpura, Vindhya, Aravalli, Guru Shikhar
Logic:
Satpura, Vindhya, and Aravalli are all names of mountain ranges.
Guru Shikhar is a peak (the highest point of a mountain). It happens to be the highest peak in the Aravalli Range.
Guru Shikhar is different from the other three because it belongs to a different category.
Guru Shikhar is the odd one out.