The correct answer is "which" because it introduces a relative clause that provides additional information about "experiences."
• "Which" (correct choice) is used to refer to a noun (experiences) and introduce a defining or non-defining clause. Here, it correctly links "experiences" to the explanation of how the mind creates them during sleep.
• "Where" (incorrect) is used for places, but dreams are not a location.
• "What" (incorrect) is used for asking questions or indicating something unknown but is not grammatically correct in this relative clause.
• "When" (incorrect) is used for time references, whereas this sentence describes dreams, not a specific time.
• "Who" (incorrect) is used to refer to people, but "experiences" is not a person, making it an unsuitable choice.
Thus, the correct answer is option (a) "which."
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