In preparing closing entries
a. each revenue account will be credited.
b. each expense account will be credited.
c. the owner's capital account will be debited if there is the net income for the period.
d. the owner's drawings account will be debited.

a. each revenue account will be credited.

Explanation:

In accrual accounting revenues and expenses are realised and recorded when the revenues are earned or when expenses are incurred.

Temporary accounts are used to store balances from the revenue or expense activities of a business.

Eventually these accounts are closed out to permanent revenue and expense accounts. Revenues are credited to reflect income earned, and expenses are debited to reflect costs incurred.

B) each expense account will be credited.

Explanation:

Revenue and expense accounts are temporary accounts since they basically show how the company operated during the year and must be rest for the next accounting period.

First all revenue and expense accounts must be closed to an income summary account. Expense accounts are closing by crediting them and revenue accounts are closed by debiting them.

Then the income summary account and the dividends account must be closed to retained earnings. The only "permanent" account in this sequence is retained earnings that is part of shareholders' equity.

d. to get countries or companies to stop doing something objectionable.