If Venus and Earth outgassed a similar amount of CO2 early in their histories, why are their surface temperatures so different today?a. Venus didn't have a detectable magnetic field, so the solar wind reached Venus's surface and evaporated additional CO2 from the crust, increasing the greenhouse effect and making its surface much hotter.b. Venus was closer to the Sun, water tended to be in the atmosphere rather than in oceans, and CO2 couldn't be dissolved. Therefore, the runaway greenhouse effect made the surface of Venus much hotter.c. Venus didn't contain any water, so CO2 couldn't be dissolved and converted into sediments. Therefore, the runaway greenhouse effect made its surface much hotter.d. Venus's moon fell onto the planet with a catastrophic impact, producing massive ejecta and increasing the abundance CO2 of in the atmosphere. Therefore, the greenhouse effect made its surface much hotter.

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