You are presented with the question "If a planet cannot sustain life, then the planet may be too close to what?" and the following answer choices: 
- a ship
 - Sun
 - sunlight
 - earth
 - a crater
 - an object
 - a moon
 - a star

Now knowing that if a planet becomes too hot then that planet cannot sustain life and if a planet is too close to a star, then it will be too hot for liquid water to exist, choose the best answer.


 

        a star 