Question

They formed _ union here

Answer 1

your answer is
"a"
because when we pronounce Union a we pronounce it with a y and since y is not a vowel it will be a

hope it helps
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Answer 2

They formed _a_ union here.
The answer here is á because while we pronounce the word union it actually makes the sound with "y". So, since y is not a vowel the answer here is "a".