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Guide Leo through his post-vacation inbox! He just returned from a relaxing beach holiday to find 400 unread emails. He needs to reply to a colleague who has been waiting for a week. Select ALL the natural and professional ways he can apologize for the delay.
The correct answers are Sorry for the delay in getting back to you. and Apologies for the late reply.
"Apologies for the late reply" and "Sorry for the delay in getting back to you" are standard, polite fixed expressions in business English. "Late" cannot be used as a noun ("my late to answer"), and "slow returning of your message" sounds very unnatural.