Bet in surge of call buying.There was a 25-fold surge in volume from 111 contracts to over 2,800 on the November 15th 2019 $16.50 call options on Petroleo Brasileiro (PBR), also known as Petrobras.The options, with shares of the Brazilian oil company trading at $15.50, would trade in-the-money with a $1 rally in shares in the next 22 days. At a cost of just $0.19, or $19 per contract, it’s a cheap bet on shares to rally in the next few weeks.