How could you increase the mass of a wooden block? Take it to Jupiter where there is more gravity. Take it to the moon where there is less gravity. Cutting it in half. None of the above.
Mass is basically a measure of how much material is there. Gravity is just the amount of force that acts on an object based on how much mass is there, and it depends on which planet you go to. The more mass the planet or moon or object has, the more gravity it exerts on another object for how much mass the other object has. So if you go to another planet it might be affected by gravity more and weigh more, but it will still have the same amount of material in it and the mass won't be affected.
@Kainui is right, in basic terms, none of the above because mass is the measure of material and not anything to do with gravity
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