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Number theory Difficulty 3.0 AMC 10/12 Find the answer Canada

The sum of the digits of the integer equal to $777\,777\,777\,777\,777^2 - 222\,222\,222\,222\,223^2$ is

(A) $148$ (B) $84$ (C) $74$ (D) $69$ (E) $79$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.