New inventions, beautiful art, and new discoveries are made during years of a civilization.

a; old age

b; adult

c; brthing

Option B.

Explanation:

Adult, is the right answer.

A civilization is any heterogeneous culture described by urban development and the stratification of society, inflicted by a cultural elite, representative methods of communication, and a recognised departure from and control over the natural environment. In its initial phase, a civilization goes through various changes and there is fluctuation in the process of settling down. However, in the Adult phase of civilization, we observe various artistic and scientific developments such as beautiful art, new inventions and discoveries etc.