You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.

Q: Question: If Mary is building a rocket and she wants it to fly as high as possible, what should she do to the mass of the rocket? 
 Option1: increase it 
 Option2: decrease it 
 Explanation: By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.

A: decrease it
****
Q: Question: If Jim is transmitting electricity through a wire and he reduces the size of that wire, the electrons move through it 
 Option1: easier 
 Option2: harder 
 Explanation: A thinner wire is more difficult for electrons to move through than a thicker wire.

A: harder
****
Q: Question: Bob heats up some gas at the plant. When he does this, the gas particles move faster and 
 Option1: gain energy 
 Option2: lose energy. 
 Explanation: If the gas is heated, the particles will move faster as they gain more energy.

A:
gain energy
****