In accounting, assets are increased by debits and decreased by credits. Therefore, the correct answer is Assets.
To elaborate:
- Liabilities are increased by credits and decreased by debits.
- Revenues are increased by credits and decreased by debits.
- Retained earnings are increased by credits (when profits are retained) and decreased by debits (when there are losses or dividends paid).
So, the primary account type that increases with debits is indeed Assets.