I would say space or a formula in math. Look up the definition in a dictionary!
I would say that both A and C could be correct.
It is indeed best to keep everything objective and impersonal in formal business correspondence, but we also use words to say precisely what we mean.
<em>Corroboration </em>is the evidence that is backed up by the initial evidence. For example, a witness says that I saw a man in black coat entering the store and buying a bag. Later, the saleswoman, who is another witness testifies that she sold the bag to the man in a black coat. In this case, both witnesses confirm the situation and the evidences coincide. When there is no corroboration, there is not any available source to confirm the same information.
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its : What goes around comes around!
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