Answer:
Saturn
Step-by-step explanation:
As you can see from the chart, the hydrogen gas is labeled by the turqoise part of the bar chart. To find which one has the most hydrogen gas, select the planet where the bar with hydrogen gas is the highest. If you compare, you will notice that neptune and jupiter have the least because the hydrogen gas is lowest on the bar chart, Saturn and uranus have a higher concentration of this gas but saturn has more than uranus respectively.