In Proof of Work group consensus, the “nonce” refers to?

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In Proof of Work group consensus, the “nonce” refers to?
A . The random data to be combined with the block data which will produce a hash output matching the current difficulty level
B . Random nonsense data inserted at the end of a block to fill it completely
C . The average Bitcoin price over the last 90 days
D . None of the above

Answer: A