Which modern convenience generally promotes physical activity?
bicycle
chainsaw
electric drill
elevator

The correct answer would be the first one - bicycle

A bicycle would be a modern convenience, something that can be acquired by most people, that promotes physical activity as it gets your body moving. An elevator promotes no type of physical activity whereas a staircase used instead would. A chainsaw isn't an item that everybody would own and you wouldn't use a chainsaw long enough for it to make a difference physically. An electric drill does not promote physical activity as you again you would not be using one for long as it doesn't take much effort to use one.

the correct answer is c