Explanation:
The activities in which human beings are engaged in different kinds of economic works to generate income are called economic activities.
or in simple words
Any work from which we can generate income are called economic activities
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Answer:
I believe that the answer is inside because it is an adverb of place.
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The correct answer is B) because a run-on sentence is a sentence which is incorrectly punctuated. In this case, B doesn't have the right punctuation mark. Instead of a comma (,) perhaps a semicolon (;) should be used.