问题如下：
Forward contract has some limitations for use:
Limitation 1: It is difficult to exit from a forward contract once investors have entered into the contract.
Limitation 2: The long party deposits an initial amount with the short party in order to enter into a forward contract.
Limitation 3: If the underlying asset's price moves adversely from the long party's perspective, the short party must make periodic payments.
Which one is a correct limitation of using forward contract?
选项：
A.limitation 1.
B.limitation 2.
C.limitation 3.
解释：
A is correct.
It is difficult to exit from a forward contract, once you have entered into the contract. At a forward contract's origination. there is no cash exchange. Also, at a forward contract, there is no exchange of cash until the contract's maturity.
看解析没有看明白为什么A正确，为什么进入了就不能退出
