The correct option is A Living things must obey the laws of chemistry and physics
Livings things have the biological organisation from the beginning of life as they can grow, respond to stimuli, reproduce. Living things have both organic elements like carbon and inorganic elements like phosphorous in their body(in humans). There are some emergent properties through which living and non-living things can be distinguished. So, the correct option is "living things must obey the laws of chemistry and physics".