The passage reflects Alex's silenced reaction when learning about Anne Frank's experience.
(a) expressing that he was done
He added that he had been feeling sad as he couldn't go swimming or cycling. Moreover, he missed his playmates. After listening to his son, Alex's father told him that Anne Frank and her family spent two years in an attic. This silenced Alex. Looking at his expression, Alex's father said that (b) he expected Alex's silence.
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