Chemistry reaction question?

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In a sealed container, the reaction
CH4(g) + H2O(g) = CO(g) + 3 H2(g)
will produce additional hydrogen gas if

a) carbon monoxide is added
b) water vapor is removed
c) the volume is decreased
d) the volume is increases


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Use le Chatelier's Principle, but very carefully. Note that the reaction causes a change from 2 moles gas to 4 moles gas, thus tending to increase total pressure at constant volume.
 
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