Answer:
Experience is the best way for entrepreneurs to learn
The answer is A, when using information from crowd-sources sources like Wikipedia, because that is public domain.
Sources of information are cited in order to give the original authors/creators proper credit for their work and to document where an author heard or read the fact or idea that has been incorporated into a new work. The purpose of citations is to let the reader know where you obtained information so sources can easily be located and consulted.
Answer:
(A) my sister has bought diamond
(B) (1) I have finished studying for the test
(2) my friend has passed her exam
(3) Amy has lived in the same house since she was born
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