I do not believe a comma is necessary in this sentence at all. In fact, if you were to insert a comma after the word grazed (as you maybe tempted to do) it could change the meaning of the sentence. If you meant the lions were oblivious of the presence of the gazelles, you would insert a comma after grazed. But if you meant the gazelles were oblivious of the presence of the lions, you would leave the comma out.
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<h3>If something changes or is done gradually, it changes or is done in small stages over a long period of time, rather than suddenly. Electricity lines to 30,000 homes were gradually being restored yesterday. Synonyms: steadily, slowly, moderately, progressively More Synonyms of gradually.</h3>
<h2>Hope it helps you.</h2>
Answer: i think it is b but don't count on me wait for some on sure just wont to let u now were here for u
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