How does livestock farming contribute to greenhouse gas emissions?

The correct option is By releasing methane during digestion. This answer is correct because it matches the approved learning objective to describe how agriculture can increase methane emissions in the subtopic Human activities which contribute to an increase in greenhouse gases in the atmosphere.

The correct option is By releasing methane during digestion. By releasing methane during digestion is correct because it directly supports the approved learning objective to describe how agriculture can increase methane emissions. This belongs to the subtopic Human activities which contribute to an increase in greenhouse gases in the atmosphere within Carbon dioxide and methane as greenhouse gases, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Human activities which contribute to an increase in greenhouse gases in the atmosphere.