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Consumer surplus is the amount of money that consumers save because they are able to buy a product at a price lower than the highest price they would be willing to pay.$\newline$The consumer surplus for a certain product increases at a rate of $\frac{900}{(x+13)}-35$ dollars per thousand units of the product sold (where $x$ is the number of thousands of units sold).$\newline$By how many dollars does the surplus increase between $x=7$ and $x=12$ ?$\newline$Choose $1$ answer:$\newline$(A) $900 \ln (0.8)-35$$\newline$(B) $900 \ln (1.25)-35$$\newline$(C) $900 \ln (0.8)-175$$\newline$(D) $900 \ln (1.25)-175$