The emperor Augustus commissioned Ara Pacis. The commissioning of the building project was done on January 30, 9 BC. Ara Pacis is also known as the Ara Pacis Augustae.
Option B is wrong because Basilica Ulpia was commissioned in 112 AD, long after the death of Emperor Augustus.
Option C is wrong because Colosseum was commissioned in 70 AD, long after Augustus died.
Option D is wrong because Pantheon was commissioned in 128 AD, many years after Emperor Augustus, who died on 19 August 14 AD.
Hence, in this case, the correct answer is option A. "Ara Pacis."
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