He tried to remember the names of all the people who were there that night.
Correct Answer: B
Rationale: The correct answer is 'B' because 'that' is used to introduce a defining clause that specifies which people he was trying to remember. In this context, 'that' is more appropriate than 'whom,' 'which,' or 'whose' as it refers to the specific people present that night. 'That' is commonly used to introduce restrictive or defining clauses, helping to identify a specific group or subset within a larger group. In this sentence, 'that night' serves as a defining characteristic, and 'that' connects the relative clause to the main clause effectively. While 'whom' refers to the object of a sentence, 'which' is used for non-restrictive clauses, and 'whose' indicates possession, none of these options are suitable replacements for 'that' in this context.
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