It would be p = 8.00h
This basically means : pay = 8 * hours worked
To find out if this is the correct function rule, we have to apply it to each "Hours worked" :
2 * 8.00 = £16.00
4 * 8.00 = £32.00
6 * 8.00 = £48.00
8 * 8.00 = £64.00
So the first option is correct because as you can see above it gives us the correct pay.