Answer:
Chuck may exercise more.
Explanation:
Being tall has nothing to do with being overweight because weight does not depend on tallness.
Everyone in their family being thin, does not mean that they have anything to do with chucks weight because he is eating the same food. Also they never mentioned why chucks family may be skinny.
And we know it's not all of the above because of the reasons above. Boop, have a wonderful day :))