Correct Answer - Option 4 : 15

__Concept:__

Step 1: Conversion: base 3 to decimal

Step 2: Conversion: decimal to Hexadecimal

__Calculation:__

Step 1:

Conversion: base 3 to decimal

(210)3 = 2 × 32 + 1 × 3^{1} + 0 × 30

= 18 + 3 = 21

Step 2:

Conversion: decimal to Hexadecimal

Read the remainder from bottom to top: (15)_{16}