Let's begin by listing out the information given to us:
Site A: $4.95 per month, $49.95 startup fee
Site B: $9.95 per month, $0 startup fee
The inequality which indicates the number of months Ian could use Site B while having his cost less than Site A is given by:

At 10 months, the cost of hosting on both Sites A & B is equal
After more than 10 months, the cost of hosting on Site A is less than Site B
At less than 10 months, the cost of hosting on Site A is more than Site B
Therefore, Ian will need to keep the Site B for less than 10 months to have a cost lower than that of Site A. This is represented by the inequality:

Hence, option A is the correct answer