What was unusual about Antoninus Pius's placement as emperor after Hadrian?
A. He was not the first choice but was appointed when Commodus died before arriving.
B. He was Hadrian's adopted son.
C. He had traveled extensively to the Balkans, Asia Minor, and Greece.
D. He was to be co-emperor along with his half-brother and, later, his son.
(Please don't just guess)
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Answer:
He was hardian's adopted son