The sentence "<em>Both of them “</em><u><em>have</em></u><em>” many other activities</em>" does not agree with its subject.
<h3>What is the disagreed underlined verb?</h3>
The underlined verb is a verb that does not agree to the subject because of its tense.
Hence, the Option B is correct.
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Answer:
Ben flies a kite during a thunderstorm and collects ambient electrical charge in a jar for him to demonstrate the connection between lightning and electricity.