Answer:
Option 2 - log base 2 of 6 over log base 2 of 3
Step-by-step explanation:
Given : Expression 
To find : Write the expression as a logarithm of base 2?
Solution :
Expression 
Applying the change-of-base formula,

On comparing, a = 3, x = 6, b = 2
Substitute in the formula,

Therefore, Option 2 is correct.
Option 2 - log base 2 of 6 over log base 2 of 3