From first figure,

$$\sqrt{25}$$ + $$\sqrt{16}$$ + $$\sqrt{49}$$ + $$\sqrt{36}$$ = 5 + 4 + 7 + 6 = 22

From third figure,

$$\sqrt{9}$$ + $$\sqrt{4}$$ + $$\sqrt{81}$$ + $$\sqrt{1}$$ = 3 + 2 + 9 + 1 = 15

The number in the middle is the sum of the square root of surrounding numbers in the figure

Similarly from second figure,

$$\sqrt{64}$$ + $$\sqrt{9}$$ + $$\sqrt{\text{X}}$$ + $$\sqrt{1}$$ = 16

$$\Rightarrow$$ 8 + 3 + $$\sqrt{\text{X}}$$ + 1 = 16

$$\Rightarrow$$ $$\sqrt{\text{X}}$$ = 4

$$\Rightarrow$$  X = 16

Hence, the correct answer is Option C