Answer:
The answer is 1/n⁴. option 2.
Step-by-step explanation:
1) You have to use the Quotient rule.

2)Then, Simplify 6 - 10 to -4.

3) And lastly you have to use the negative power rule:

And Therefor, the answer is, 1/n⁴.
B; C is wrong as it cannot be expressed by the speedometer, leaving A, B, and D. B is correct as is suggests accuracy to the best possibility.
Merry Christmas! Hope I helped!