Answer:
1.

2.539
C
Step-by-step explanation:
Green house gases is known as the gases that educes the infrared radiation of the earth crust. If allows ultraviolet rays of the sun penetrate into the ozone layer(a protective covering in the earth's atmosphere.
Venus is known as the earth's twin because of it close proximity in size with the earth.
venus "no greenhouse" temperature will be
if its clouds were more transparent, giving a reflectivity similar to earth.
2, The actual surface temperature will be 539 deg C, if the green house effect increased . green house effect will actually increase the surface temperature of the venus.