Which of the above molecules contains a carboxyl functional group?

(see attached image)

B

Explanation:

Option B has carboxyl ( both hydroxyl and carbonyl group )

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a