Answer:
In Function library you would find the use in Formula function
Let's say for example that the business is taking in $2000 of revenue. That is the amount that the business collected for it's services - like for fixing the computer. What if though it costs $500 for the equipment (that's an expense). Now they only made $1500. Now the customer complains and says that the computer isn't fixed properly so the company sends out a techie for 2 additional hours. They need to pay their employee (another expense). Now the $1500 is down to $1400. They would have utilities to keep their lights on and insurance and many other expenses.
Your profit looks like this:
Profit = Revenue - Expenses
I would vote for D since you can adjust picture positioning and wrapping. A is BS, B and C are not true.
Answer:
You should find a good game engine that is not hard. Unity and Unreal are some good ones.
You should also search for the programming language you like the most, and use engines that use that specific language.