One Observational Fact That Is Common to Both Jupiter and Saturn

One observational fact that is common to both Jupiter and Saturn is that:

A) both planets appear cooler than is expected on the basis of received solar energy and emit less radiant energy than expected.
B) the temperature appears to fall continuously as depth into these planets increases, leading to the conclusion that the interiors of these planets are probably extremely cold.
C) CO₂ in their atmospheres appears to produce an intense greenhouse effect with very enhanced atmospheric temperatures of greater than 200°C in the outer layers.
D) both planets emit more energy (in the form of infrared radiation) than they receive from the Sun.