This Figure Shows a Disconformity Between an Upper Dark Layer

This figure shows a disconformity between an upper dark layer being deposited by the sea) and a lower light-colored layer. What happened to form this disconformity?

A) The lower layers were tilted and untilted before deposition of the upper layers.
B) The boundary between the two units indicates that for a time there was either erosion or no deposition.
C) The lower limestones were converted into another rock type by seawater.
D) The upper layer must have been deposited by volcanic eruptions.

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