穿过闭合回路的磁通量随时间变化的图像分别如图①—④所示，下列

穿过闭合回路的磁通量随时间变化的图像分别如图①—④所示，下列关于回路中产生的感应电动势的论述，正确的是（）

A．图①中回路产生的感应电动势恒定不变

B．图②中回路产生的感应电动势一直在增大

C．图③中回路在0—t₁内产生的感应电动势小于在t₁—t₂内产生的感应电动势

D．图④中回路产生的感应电动势先变小后变大

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