An Option, in the financial sense, grants the holder the right, but not the obligation, to buy (call) / sell (put) at a stated price in a specific timeframe. To do so is exercising the option before its expiration.
These form the basis of strategies such as speculation and hedging. To assist with this there are a series of properties known as the Greeks. Because We can only be certain about now, these may have practical implications when considering future work, because Future work is an option
Delta: the rate of change between the option's price and a change in the underlying asset price (price sensitivity)
Theta: the rate of change between the option's price and time (time decay towards expiration)
In times of uncertainty there's also value in holding the option, because An Option is freedom of choice
In the context of Agile development, An Option is freedom of choice - rather than sticking to a definite plan of action, which builds risk up until the point of delivery, options act as risk-reducers.