Correct option is C
Given:

Logic:
(Left Number in Base)2 = Right Number In Base
(Right side number in Base)Middle Number = Top Number
First Triangle:
Base: 1 (Left), 1 (Right)
1 → 1
(1)² = 1
1 → 1
(1)² = 1
Second Triangle:
Base: 2 (Left), 4 (Right)
Second Triangle:
Base: 2 (Left), 4 (Right)
2 → 4
(2)² = 4
4 → 16
(4)² = 16
Third Triangle:
Base: 5 (Left), 25 (Right)
(4)² = 16
Third Triangle:
Base: 5 (Left), 25 (Right)
5 → 25
(5)² = 25
25 → ?
(25)² = 625
? = 625
Thus, he correct optio is (c) 625






