Final answer:
The cost of shipping for the small business in 2012, when the shipping expenses were half of what they were in 2000, is represented by the expression 1/2(s). This reflects the reduction in costs due to the increased use of e-mail.
Step-by-step explanation:
If the cost of shipping expenses for a small business in 2000 was s dollars, then to find the cost of shipping in 2012, we need to calculate half of that amount. Given that the use of e-mail increased, it led to a reduction in shipping expenses whereby the shipping cost in 2012 was half of the cost in 2000. Therefore, the expression for the cost in 2012 would be s divided by 2, which can be written as 1/2(s). This corresponds to Option A from the choices provided.