225. Of the various possible methods shown in the illustration, which is the correct method of attaching a TXV feeler bulb to a large suction line (7/8″ and larger) with a horizontal run

Choice C is correct; a TXV bulb on a large horizontal suction line must be clamped to the side of the line (around the 4 or 8 o'clock position) to accurately sense suction gas temperature and avoid oil pooling or false readings.