Extremely high respiratory activity (> 60 mg CO2 kg-1 hour-1) is found in . . . . . . . . vegetable.

Answer: Option A

Extremely high respiratory activity (> 60 mg CO₂ kg^-1 hour^-1) is found in Asparagus vegetables.
Asparagus officinalis is a perennial flowering plant species in the genus Asparagus. Its young shoots are used as a spring vegetable.
Asparagus is classified as perishable due to a high respiration rate and rapid degradation of quality. As respiration indicates metabolic activity it seems logical that it determines the rate at which a product deteriorates.