Final answer:
The proper journal entry for interest received from the bank is a debit to Cash and a credit to Interest Revenue for $850, reflecting the increase in cash and the recognition of income.
Step-by-step explanation:
The journal entry Mason Company would be required to record for the interest received from the bank is a debit to Cash and a credit to Interest Revenue for $850. This would recognize the increase in cash due to interest earned on Mason Company's account held at the bank, and it would acknowledge the corresponding income that resulted from the interest payment made by the bank for using Mason Company's deposits. The correct answer to the question is A. debit Cash and credit Interest Revenue for $850.