The stepped Doric columns and frieze is the major contributing feature to the tempietto.
What is tempietto?
The tempietto is a small round sacred structure which is found in the Bramante's tempietto in Montorio, Rome.
The tempietto are one of the feature of the Roman architecture.
Hence, the stepped Doric columns and frieze is the major contributing feature to the tempietto.
Therefore, the Option A is correct.
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