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B’s play of the queen with the jack exposed on the table denies the ten, which must be in the dealer’s hand.
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B’s play of the king denies the queen. To continue the suit might allow the dealer to make two tricks. A should abandon the suit until B can return it through the dealer’s hand.
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It is impossible to tell whether the king is held by the dealer or by B. The suit, however, may be continued with the ten. If B holds the king this may shut out the jack. If the dealer holds the king probably nothing will be lost.
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B’s play of the ace denies the king, which should be placed with the dealer.
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It is customary holding the ace and jack with the king or queen in dummy to finesse the jack third in hand. B’s play of ace would, therefore, deny the jack, which is marked with the dealer. Avoid continuing the suit.