How are oxygen and carbon dioxide exchanged between the alveoli and the capillaries?
A. Endocytosis
B. Osmosis
C. Simple diffusion
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D. Active transport

B. Osmosis

Explanation:

Osmosis is the process in which oxygen and carbon dioxide exchanged occur between the alveoli and the  capillaries because the oxygen enters the body and the carbondioxide gas leaves the cell through a semi-permeable membrane and we know that Osmosis is a process in which smaller molecules moves from higher concentration to lower concentration through semi-permeable membrane of the cell.

"d.) carbon dioxide and hydrogen sulfide"

c. establishing proper sleep hygiene