The correct answer is A. option.
An option is a contract that gives the buyer the right, but not the obligation, to buy or sell an asset at a specified price on or before a specified date. The seller of the option, called the option writer, is obligated to fulfill the terms of the contract if the buyer exercises the option.
Options are often used to hedge against risk or to speculate on the future price of an asset. For example, a farmer might buy a put option on corn to protect against a decline in the price of corn. If the price of corn does decline, the farmer can exercise the option and sell the corn at the specified price, even if the market price of corn is lower.
A written contract is a contract that is created in writing. It is a legally binding agreement between two or more parties. Written contracts are often used for complex transactions or transactions that involve a large amount of money.
A determined contract is a contract that has a specific outcome. For example, a contract to sell a house is a determined contract because the outcome of the contract is the sale of the house.
A featured contract is a contract that has special features or benefits. For example, a contract that includes a warranty is a featured contract.
In conclusion, the correct answer is A. option.