Which of the following best describes a noncontact force?
a. a force that is able to act at a distance
b. a force that must be physically touching the object it acts on
c. a force that always pulls objects backward
d. a force that always pushes objects forward

A.) a force that is able to act at a distance

Explanation:

A non contact force is a force that doesn't need to be physically touching and object to have it's force used

(I might be wrong though correct me if I am)

Hi! I may not be much help, but here is what i think the answer is.

i think that the answer is b) sewing threads, based on books i've read about thomas edison, and what was available at the time period.