ILL GIVE BRAINLIEST HELP (photo, i dont have a scientific calculator)

Answer:
A or 8.5E-12
Step-by-step explanation:
I first did 1.7 * 10^-11. Which I received an answer of 1.7E-11. Because we know that a radius is .5 of a diameter I divided my previous answer by 2 and received 8.5E-12 or your letter A as my answer.