Fill in the blank with the most appropriate idiom. This is strictly ______ but some changes are going to happen in the company in the near future.

Options

A. off the rails
B. off the key
C. off the mark
D. off the record

Explanation

(d) off the record-not made as an official or attributable statement.
(a) off the rails - to start behaving in a way that is not generally acceptable
(b) off the key- varying in pitch from the proper tone of a melody
(c) off the mark-incorrect or inaccurate.