Answer:
A. giving speeches
Explanation:
When someone is communicating there is no greater way than for them to give a speech!!
The way at which a campaign workers communicates an information during a campaign is by giving speeches.
These are hired or volunteers people who do the job of campaigning for a candidate in the public.
They communicate an information about the candidate during a campaign by giving speeches.
Therefore, the Option A is correct.
Read more about campaign workers
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