You are presented with the question "What causes tides?" and the following answer choices: 
- waves
 - sunlight
 - Mass
 - moon
 - weight
 - force
 - wind
 - asteroid

Now knowing that the gravitational pull of the Moon on Earth 's oceans causes the tides and for example, ocean tides are caused by the sun and moon's gravity pulling on the water, choose the best answer.


 

    moon     