Answer:
A is the answer. Bigger.
Step-by-step explanation:
You would never say, "My cat is more big than your cat."
You would always say, "My cat is bigger than your cat."
Good luck - Hope this helps.
Bigger
Comparative adjectives compare two things and either end with -er or start with the word 'more'.
Since the phrase "more big" isn't grammatically correct, the right answer is bigger
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