Comparing CO2 and CH4 properties

Steps:

• Check carbon content: CO2 (CO₂) and CH4 (CH₄) both include carbon atoms, so true (✓).
• Check greenhouse gas status: Both absorb infrared radiation, contributing to warming, so true (✓).
• Check pH effect: CO2 + H₂O → H₂CO₃ (carbonic acid), lowers pH; CH4 dissolves minimally without forming acids, does not lower pH, so both false (x).
• None of the options match ✓ ✓ x.

Not enough information.

Final answer: Not enough information.