経済的な発展に伴い、国民の生活も徐々に豊かになった。
• どんどん
• かなり
• だんだん
• 少し

English: "With economic development, the people's lives gradually became more affluent."

Key vocabulary:

発展（はってん）- development

に伴い（にともない）- along with

徐々に（じょじょに）- gradually

豊か（ゆたか）- affluent

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徐々に means "gradually" but is this a どんどん or a だんだん?

どんどん is a little faster than だんだん. This of the beat of a drum getting faster and faster どんどんどんどん

e.g. 先生はどんどん話しつづけた。- The teacher talked on and on.

e.g. 人口はどんどん増加していた。- There was a steady increase in population.

e.g. 状況はどんどんひどくなる。- The situation gets worse and worse.

Whereas だんだん is more gradual, with change happening steadily as if going up steps one by one, だんだんだんだん.

e.g. 祖母はだんだん忘れっぽくなり、弱ってきた。- My grandmother was gradually becoming forgetful and frail.

e.g. 生徒の数がだんだん減ってきた。- We're getting fewer and fewer students.

徐々に means a slow gradual increase. It's the same kanji used in 徐行（じょこう）"go slowly".