Comparing chemical properties of CO2 and CH4 Steps:

• Check carbon content: CO2 (CO₂) and CH4 (CH₄) both include carbon atoms, so true (✓).
• Check greenhouse gas status: Both trap infrared radiation, contributing to global warming, so true (✓).
• Check pH effect: CO2 dissolves to form H₂CO₃ (carbonic acid), lowering pH; CH4 is nonpolar and does not form acids, so false (X).
• Correct row requires ✓ for carbon, ✓ for greenhouse, X for pH; provided choices incomplete/ambiguous.

Why B is correct: Not enough information—B marks carbon as X (false) despite both containing C, contradicting basic formulas CO₂ and CH₄.

Why the others are wrong:

• A: Marks greenhouse as X (false) despite both being greenhouse gases per atmospheric science definitions.
• C: No information provided.
• D: Identical to B, incorrectly marks carbon as X.

Final answer: Not enough information.