Explanation:
The expression that we have is:

And we need to find the equivalent expression.
Step 1. First, we solve the square root of 16 which is 4:

Step 2. Then, to eliminate the square root in the denominator, we multiply the expression by:

This is a multiplication by 1 and it does not affect the expression but it will help us to eliminate the square root in the denominator.
Step 3. Simplifying:

Step 4. The final step is to simplify the 4/6 by 2/3, which is an equivalent fraction, and this is the final result:

which is shown in option B.
Answer: Option B.