In the current year, Jonathan earns $12,000 in net investment income and incurs $15,000 of investment interest expense. What is the maximum amount of investment interest expense he is allowed to deduct this year?

A) $0

B) $5,000 deductible this year; $10,000 carried forward to next year

C) $12,000 deductible this year; $3,000 carried forward to next year

D) $15,000 deductible this year; nothing to be carried forward to next year