Which of the following groups of accounts have a normal debit balance
a) revenue, liabilities, and capital
b) assets, capital, and withdrawals
c) liabilities, expenses, and assets
d) assets, expenses and withdrawals

Option (C) is correct.

Explanation:

Correct option: A $50 billion decrease in government spending would be the most contractionary fiscal policy.

A. Increase the taxes by $40 billion is also a contractionary fiscal policy but it doesn't have a greater impact than decreasing  the government spending by $50 billion.

B. It is an expansionary fiscal policy.

D. There are both expansionary fiscal policy by decreasing taxes by $10 billion and contractionary fiscal policy by decreasing government spending by $40 billion. But it doesn't have much impact as the option (C) is having.

Therefore, Option (C) is having the most contractionary fiscal policy.