The answers is
unimportant
unsupported
One of the two I say unsupporting but the context and the thesaurus doesn't really explain so i say go with either one.
I would say it is probably common knowledge, because it isn't someone else's idea, but if you found it online or in an article you would probably want to credit any thoughts, ideas, or quotes. Be sure to state whose calculated this number also.
Answer:
Nelson Rolihlahla Mandela 18 July 1918-5 December 2013) was a South African revolutionary political leader and who was served as president of South Africa from 1994 to 1999 he was the country's first black head of state and the first elected in a fully representative democratic election his government focused on dismantling the legacy of apartheid by tackling institutionalised racism and fostering racial reconciliation. Ideologically an African nationalist and socialist he served as the president of the African national Congress (ANC) party from 1991 to 1997
Explanation:
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This is about Nelson mandela
Future perfect tense means that an action will be completed before another point in the future, which means that the answer would be (d). hope this helped!