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Answer: BSet 2: Words in Context (Intermediate)
Explanation
PASSAGE
Blockchain technology is praised for its ______, as the decentralized ledger makes it extremely difficult for any single party to alter past transaction records.
Which choice completes the text with the most logical and precise word or phrase?
A. mutability
B. immutability✓ Correct
C. fragility
D. complexity
Detailed Explanation
If records cannot be altered, they are 'immutable'. Immutability is the quality of being unchanging over time or unable to be changed.
Key Evidence:
• "difficult ... to alter"
• "past transaction records"
Why others are wrong: A (Mutability means ability to change.), C (Fragility means easily broken.), D (Complexity implies difficulty to understand, but the context focuses on alteration.).