Answer:
Mother bought a pair of new slippers for Minjur.
In general, the story of Everyman is about how he faces betrayal and is deceived by the people whom he thought were inconditional to him. In this case, the correct answer is number 3, he is making excuses to avoid accompanying Everyman. Cousin is not actually injured, he just does not want to help Everyman in his suffering.
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Both options are technically grammatically correct, but the one that makes the most sense in this sentence is "when."