Answer:
Option 3
The second and fourth line rhymes and have same numbers of syllables.
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Just use the dictionary, you could use an actual book, or you could use the online dictionary.
Explanation:
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1a. (advocate)
1b. (exploit)
2a. (innovative)
2b. (hub)
3a. (indebted)
3b. (spearhead)
4a. (estimate)
4b. (documentary)