Final answer:
The conjunction used in the sentence is 'and,' which joins the nouns 'the flowers' and 'the plants.' The correct answer is option 3.
Step-by-step explanation:
In the sentence 'Nancy took her the flowers and the plants,' the conjunction used is 'and.'
Conjunctions are words that join words, phrases, or clauses in a sentence. In this case, 'and' is used to join the noun phrases 'the flowers' and 'the plants,' indicating that Nancy took both the flowers and the plants. The verb 'took' is plural to agree with the plural subject.
Some other common conjunctions include 'but,' 'or,' 'nor,' 'yet,' 'so,' 'for,' and 'because.'