Marilyn filed her tax return on April 15. At that time, she owed $900 on a total tax liability of $10,000 and she submitted a check for $900 with her tax return. Which of the following penalties will apply to Marilyn?
A. Failure to file.
B. Underpayment of estimated tax.
C. Failure to pay.
D. None of the penalties apply to this return.