They are the same. B.C.E is the modern adaptation of B.C.
B.C. --> A.D.
B.C.E ---> C.E
Most modern history textbooks use BCE and CE.
<span>https://www.britannica.com/biography/Pedro-I </span>
Vassals
<span>A vassal refers to a person who was permitted to
acquire land on the grounds that he offered allegiance and homage to the nobles
of society in return. Nobles granted the use of
farmlands to vassals in exchange for vassals’ services such as political
support, serving as military soldiers and paying taxes. </span>
<span> </span>
Answer is 1. Geocentric system for this question