A factor of production whose quantity can be changed during a particular period is

a. a. marginal factor of production.

b. fixed factor of production.

c. incremental factor of production.

d. variable factor of production.

The answer is D.

Factor production that could be changed during particular period is called Variable Factor of Productions.

Basically, factor of productions is divided to fixed and variable factor.

FIxed factors are the one that will always stay the same no matter how many products you made. For example electricity cost, building rent, etc

The variable factors differ depend on how product you produce, such as raw material.