To subtract vectors, you simply have to subtract correspondent coordinates.
So, if you have

the subtraction is simply

So, in your case, we have

the answer for 1296.5 times 10.2 is
13224.3
You are subtracting the results in the parenthesis.
I would go with a difference.
Since 8 is being multiplied by 23.6 and -7.8, I would say product.
"A" is the best answer choice.
I hope this helps!
~kaikers