Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by

• A. making the volume of thermometer bulb as large as conveniently possible.
• B. reducing the volume of the capillary to a minimum.
• C. reducing the volume of the receiving element to a minimum.
• D. all 'a', 'b' & 'c'.