Pune is bigger than Jhansi, Sitapur is bigger than Chittor.
Raigarh is not as big as Jhansi, but is bigger than Sitapur.
Which is the smallest ? 

Answer: D. Chittor

In terms of size, we have :
Jhansi < Pune,  Chittor < Sitapur,  Raigarh < Jhansi,  Sitapur < Raigarh.
So, the sequence becomes :
Chittor < Sitapur < Raigarh < Jhansi < Pune.
Clearly, Chittor is the smallest.