Answer:
D. A director of technology analyzes the bounce rate (BR) of a website at least once a month.
Step-by-step explanation:
"bounce rate" is not capitalized, but its abbreviation is. Therefore, it follows the style guide.
Initially, you also might think that A is also correct, but remember that the Federal Trade Commission (FTC) is a proper noun, so it should be capitalized, even though it has an abbreviation.