Brock earned a salary of $75,000 in the current year. He also received $25,000 in taxable interest income. In addition, he incurred a loss of $10,000 from an investment in a passive activity which he purchased at the beginning of the current year for $6000. How much of the passive loss, if any is deductible by Brock during the current year?

A. $0 B. $4000 C $6000 D.$10000