Question

if we define the ______ as the change of the physical distance divided by time, then distant objects do recede from us faster than the speed of light, but this is only because space is expanding. source: scientific american density velocity neutrality diversity

Explanation:

Velocity is defined as the change in physical distance divided by time. Density is mass per unit volume, neutrality is related to electrical or chemical balance and has no relation to distance - time ratio, and diversity refers to variety.

Answer:

B. velocity