The correct answer is 2.

Please Note:
Use inverse operations to solve the equation for a variable.

Solution:
To solve the given equation for variable s, we use inverse operations.

Given equation:
s + 16 = 18

Now, subtract 16 from both sides and simplify.

s + 16 – 16  =  18 – 16

⇒            s    =   2

So, the value of s is 2.