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What is true about indexes?

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What is true about indexes?

(a) Indexes enhance the performance even if the table is updated frequently

(b) It makes harder for sql server engines to work to work on index which have large keys

(c) It doesn’t make harder for sql server engines to work to work on index which have large keys

(d) None of the mentioned

I got this question in semester exam.

My query is from Index Definition in SQL in chapter Indexing and Hashing of Database Management

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Correct option is (b) It makes harder for sql server engines to work to work on index which have large keys

The best I can explain: Indexes tend to improve the performance.

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