Oil’s plunge is bringing some excitement back into the market. As futures in New York slipped to the lowest since OPEC’s output deal in November, options trading surged and signaled the biggest bias toward a price decline in six weeks. That’s a stark departure from last month, when the West Texas Intermediate benchmark traded at the narrowest price band since 2003. “We were in such a tight range,” Tariq Zahir, a New York-based commodity fund manager at Tyche Capital Advisors LLC, said by telephone. “There is definitely going to be some volatility put in the options market because you are seeing a bigger movement in ... (full story)