Question

mars has no liquid water on its surface today, though robotic rovers have confirmed that it did at some point in the past.
venus is similar to earth in terms of size and mass, but its surface pressure is ninety times higher.
while venus has surface temperatures that are hot enough to melt lead, the average temperature on mars is -67°f.
choose the best topic sentence to introduce a paragraph containing these details.
venus and mars are close to the earth, but their temperatures are too hot for humans.
the planets closest to earth have inhospitable conditions that cannot support human life.
some planets close to the earth may have supported life in the past, but they dont now.

Explanation:

The details discuss the inhospitable surface - conditions (lack of liquid water, high surface pressure, extreme temperatures) of Venus and Mars, which are the planets closest to Earth. The chosen topic sentence encompasses these conditions and their implications for human life.

Answer:

The planets closest to Earth have inhospitable conditions that cannot support human life.