You may choose to pay income tax jointly or separately from your ______.

A．lifeguards often failed to notice the people who get drowned
B．AI is an idea invented by a French company
C．anyone in the water can be saved by the AI
D．people often get drowned in Britain

A．It must be able to swim.
B．It must keep walking round the pool.
C．It can distinguish between a swimmer and a shadow.
D．It can save a life within a few months.