Any tax return preparer who prepares any return or claim for refund with respect to which any part of an understatement of liability is due to a willful attempt in any manner to understate the liability for tax on the return or claim or a reckless or intentional disregard of rules or regulations shall pay a penalty with respect to each such return or claim in an amount equal to the greater of $5,000, or what percent of the income derived (or to be derived) by the tax return preparer with respect to the return or claim?

A. 10% B. 25% C. 50% D. 75%