Which of the following sentences should have commas added to offset a nonrestrictive clause?

Question

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The shoes I chose to wear are very expensive.
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Those shoes which were expensive should get me through many special occasions.
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The shoes that I wear will be appropriate for the occasion.
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Shoes worn for special occasions are often very expensive.
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Answer 1

The sentence that should have commas added to offset a nonrestrictive clause is:

"Those shoes, which were expensive, should get me through many special occasions."

In this case, "which were expensive" is a nonrestrictive clause, providing additional information about the shoes but not essential to the main point of the sentence. The other sentences do not contain nonrestrictive clauses.