30.學生看到同學因上台分享而獲得老師稱讚，之後自己也更願意嘗試。這屬於哪一種增強形式？
(A)自我增強(self-reinforcement)
(B)負增強(negative reinforcement)
(C)直接增強(direct reinforcement)
(D)替代增強(vicarious reinforcement)7

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統計： A(0), B(0), C(0), D(1), E(0) #3961565