A. A situation wherein someone has the privilege of enjoying two different opportunities
B. A phrase implying that a person is never satisfied with their current situation;
C. People's intentions can be judged better by what they de than by what they say
D. Just the information I have on the subject
Explanation
The phrase "Best of both worlds" means that someone is able to enjoy the advantages of two different situations or options simultaneously, often in a way that seems ideal or perfect.
It implies that they are able to reap the benefits of two different things that might normally be mutually exclusive.