It is B, smoke and air pollution can stress the lungs and cause things like Respiratory distress if not wearing a proper mask. That is why in places with massive amounts of air pollution many people will wear face masks.
The answer is A. 2 electrons will go in 1s orbital, 2 more electrons will go in 2s orbital. because the last 5 electrons will go in the 2p orbital but you only want the s orbitals
<span>Provide a direct contact between the oxidation and reduction electrodes - A</span>
