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The greenhouse effect is because of the:

1. presence of gases, which in general are strong infrared absorbers, in the atmosphere
2. presence of CO2 only in the atmosphere
3. pressure of O3 and CH4 in the atmosphere
4. N2O and chlorofluorohydrocarbons in the atmosphere

Correct answer: presence of gases, which in general are strong infrared absorbers, in the atmosphere

Solution

The greenhouse effect occurs due to gases like CO2, CH4, N2O, and others that absorb and trap infrared radiation, leading to warming of the Earth's atmosphere. Option A is the most comprehensive and correct.

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