Economic growth takes place when a country

I believe the answer is: measures its gross domestic product (GDP).

Gross domestic product accounted for all valued goods or services that the nation managed to produce on a single year.

A country is considered to be experiencing economic product if the gross domestic product for the current year is bigger compared to the gross domestic product from last year

An economic growth means that a country produces and consumes more than in the past - this is the correct answer. This means that a poorer country can have a higher economic growth than a richer one - since it's only compared to its economic activity before, and not to the economic activity of the other countries.