See the multi-choice question below:

Sentence 1: The greatest of the Byzantine emperors was Justinian the Great (ruler from 527 to 565), who introduced an equitable legal system, and also extended the boundaries of the empire into Spain, Italy, and Africa.

Sentence 2: Justinian the Great was the best Byzantine emperor.

If the first sentence is true, then is the second sentence true?
Available options:
A). yes;
B). it is not possible to tell;
C). no;
A).