A practical class was going on where the students were demonstrating ATP synthesis in vitro using active mitochondria. Some students added one of the following to their tubes :-

A. Dinitrophenol (DNP), an uncoupler

B. Mild acidification of the medium

C. Glutilferone, that permeabilizes both the membranes

D. An outer membrane permeable H⁺ quencher compound, Elila

In which one of the above, ATP synthesis will be detected?