Which of the following is considered a research activity? (a)construction of a prototype.(b)operation of a pilot plant.(c)critical investigation aimed at discovery of new knowledge.(d)all of these answer choices are correct.

(c) The critical investigation aimed at the discovery of new knowledge.

Explanation:

The process that involves the study of scientific knowledge by the help of the specific means and methods. The aim of the study involves the development of cognitive skills and grasping the other qualities and abilities. It deals with the discovery and establishment of the facts and theories.

answer; i believe its   (india); this is the correct answer; /// good luck

answer; john stuart mill's principle of utility is your answer; /// good luck