2. If the ETF is initially trading at $160/share when he opens the account, how low may the price fall to before triggering a margin call? A) A call will be triggered immediately, Roger must post an additional $4800 or the account will be shut B) The price may fall by 20% ($32/share) before a call is triggered C) The price may fall by 11.11% ($17.77/share) before a call is triggered D) The price may fall by 10% ($16/share) before a call is triggered E) The price may fall by 90% ($/share) before a call is triggered