VXX volume is up today, 8 million, around 2x yesterday's volume. Maybe someone is hedging a VXX position with those options. (VXX isn't optionable).
i doubt its a hedge - the figures (option underlying) dont add up. besides, when big money gets in to a position, their main problem is often finding liquidity to absorb their interest (nice problem to have!). if they want to take a position, they will buy the futures, the etf, long calls, short puts and every other instrument they can lay their hands on. this may also help cover their tracks to some extent. not in this case!.....