Development examines the influences of learning, memory, problem solving, and intelligence and how each changes over time.
(a) cognitive
(b) personality
(c) social
(d) physical

Option (a) is correct

Cognitive development can be referred to as a discipline in neuroscience and psychology which mainly focuses on an individual's development (mainly children) in terms of information refining, conceptual, emotional skill, language learning, and several other variables of the developed brain and psychology.

Therefore, Cognitive development is the correct answer.

c. reserves power to the states and people

answer; they burn down the bushes and trees;