I am pretty sure the correct answer is B.
It makes the most sense to me.
Answer:
Formic acid H. COOH
Acetic acid CH3.COOH
Propionic acid CH3 . CH1 . COOH
Butyric acid CH3 . CH1 . CH1 . COOH
Explanation:
A element mixture (key word: mixture) due to the mixture containing 2 different types of elements it can be said that it’s highly likely that the mixture was not a compound but instead of a mixture due to mixture meaning more than 1 material. Hopes this help!
Minerals are inorganic and coal is made of decomposed plants, which are organic