Why is the full Merkle path needed to verify a transaction?

Why is the full Merkle path needed to verify a transaction?

If I have transaction A that I wish to verify is in the block and the hash of transaction B and also the hash of the hashes of A and B, can't I just hash A and then see if what I get by hashing A and B's hash is equal to what is in the Merkle tree? Why do I have go all the way to the root?

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