Which phrase indicates that a speaker wants to move away from the central topic for a moment and tal

Which phrase indicates that a speaker wants to move away from the central topic for a moment and talk about something not included in the presentation?

A.I would like to go back to the topic of benefits.

B.I would like to move ahead the topic of bad effects now.

C.If I may digress, I would like to ask you what you think about our new office building.

D.Let’s now look at this bar chart.

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