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The prepayment of expenses simply increases one current asset and decreases another current asset by the same amount. This will cause the level of working capital to remain the same. See the correct answer for a complete explanation.
The collection of a receivable simply increases one current asset and decreases another current asset by the same amount. This will cause the level of working capital to remain the same. See the correct answer for a complete explanation.
Only a transaction that involves the elimination of a current liability by replacing it with a long-term liability will change the level of working capital. The other choices will change the level of current assets or current liabilities, but not the level of working capital.
The purchase of temporary investments for cash simply increases one current asset and decreases another current asset by the same amount. This will cause the level of working capital to remain the same. See the correct answer for a complete explanation.