One of the reasons that sales have declined in recent years ____________ the lack of effective social

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One of the reasons that sales have declined in recent years ____________ the lack of effective social media advertising.

(a) is,

(b) are 

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Related Book For  answer-question

Essentials Of Business Communication

ISBN: 9781337386494

11th Edition

Authors: Mary Ellen Guffey, Dana Loewy

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