Simple molecules and covalent bonds — practice question

Which statement explains the way the C-H bonds in methane gas in the atmosphere help to cause global warming?

• AThey absorb thermal energy from the Sun and emit some of this energy into space.
• BThey absorb thermal energy from the Sun and emit all of this energy towards the Earth.
• CThey absorb thermal energy from the Earth and emit all of this energy towards the Earth.
• DThey absorb thermal energy from the Earth and emit some of this energy towards the Earth.