I think it is c hope it helps
I’d say A. noun clause since it’s the subject of the sentence and is describing a singular person (noun)
Answer:
Blockchain technology or A blockchain
Explanation:
"Every time a person makes a transaction using a cryptocurrency — for example, using funds stored in his or her crypto wallet to send bitcoin to someone else — the transaction is recorded on a digital ledger called a blockchain."
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Answer:
is one that competes one selling or buying goods or services in the same market as another offering lower price for a specific good.