C.
None of the others seem to be true.
At first the people does not bluntly show gratitude to Jim, they treat what he does as his work which does not need gratitude. Later on, they learned that they must thank him for his work even if he gets paid for doing it. They should still show gratitude to him, this boosts his morale and will make him enjoy his work more.
Since <em>contrast</em> in short means to compare,
A. would be the best answer, since it compares the qualities of a dog to a cat.
Hope I helped!
It was a sight to see fish at lunch and sometimes they would jump up and kiss you on the cheek.
A tissue or organ on which a hormone exerts its action; generally, a tissue or organ with appropriate receptors for a hormone
