Answer:B. George has a bigger appetite than Harry
Explanation: comparative adjective makes comparison between two nouns by using adjusting words such as faster, smaller and bigger.
In the sentence above there is a comparison between two people George and Harry .
'Bigger than ' is used as a comparative adjective to compare the appetite level between these two .
When more than two nouns are being compared if is then referred to as a superlative adjective.
