Answer:
a conjuction
Explanation:
just remember FANBOYS ( For And Nor But Or Yet So)
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Streaking across the sky was a pattern of lights, it could be a helicopter or an airplane.
The first word in the sentence is a pronoun- not an adjective.
The second option - Australian is in fact an adjective, it gives some information about the terrier.
the second option - children - is a noun, so it is not an adjective.
And the last option is a verb,
So the correct answer is B - this is the only adjective.