Which of the following is an allylic cation? 
Definitions:
Exercise Price
The price at which an option holder can buy (call option) or sell (put option) the underlying asset or security.
Call Options
Call options are financial contracts that give the buyer the right, but not the obligation, to buy a specified amount of an underlying asset, at a set price, within a specified period.
Put Options
Financial contracts giving the owner the right, but not the obligation, to sell a specified amount of an underlying security at a specified price within a specified time frame.
Stock Price
The current price at which a share of a company is bought or sold on the stock market.
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