You did not have to have exactly two options, but you have nothing to decide if there are not at least two options. However, there are almost always at least two options, although sometimes one of the options is unacceptable. If neither option is reasonable, find a third way.
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When there are only two choices in a decision, it is not as difficult as if you had several options. When trying to choose the right key for instance to open a door, only two options would make this faster.
There are many options, the easiest answer is 1 and 154.
Two intersecting rays form an angle. Without two rays you do not have an angle.
A Decision-making grid.
earlier for two options (which is actually one option!), earliest for more than two options.