The plague beak masks were made with solid leather. Plague doctors believed that the<span> mask filled with aromatic items could protect them from putrid air, but that actually turned out to be </span>the cause of infection (proved by <span>miasmatic theory of disease developed later).</span>
The Impressionist painters (B) such as Renoir and Monet were known for painting "en plein air" style out doors. The correct answer is B.
https://en.m.wikipedia.org/wiki/En_plein_air
I believe your answer in terms of music would be ‘One Beat’ (: