Answer:
a. Increase both an asset and capital stock.
Issuance of common stock increases the cash as assets and common stock as a capital stock.
b. Increase both an asset and a liability.
Supplies purchased on account increases the Inventory as an asset and Increases the payable as a liabilities.
c. Increase one asset and decrease another asset.
Maturity of an Investment in debt instrument, Increases the cash as an asset and decreases the investment as another asset.
d. Decrease both a liability and an asset.
Payment to supplier decrease the account payable as a liabilities and cash as an asset.
e. Increase both an asset and retained earnings.
Cash Sales Increases the cash as an asset and Net profit as a retained earning.
f. Decrease both an asset and retained earnings.
Sales return decreases the account receivable as an asset and net profit as a retained earning.