A stock sells for $30 and a 6-month call on the stock with a $30 strike trades for $5. If the stock goes to $40, which of the following is true: Spending $30 to buy 1 share of stock offers the greatest percentage return on investment Spending $30 to buy 6 call options offers the greatest percentage return on investment Buying the 1 share of stock for $30 has the same percentage return as buying 6 call options for $30 Writing 6 call options offers a risk-free return