Grammar一問

Number 1 is correct because you must use "an" before a vowel word. (words that start with a, e ,i , o or u.)
e.g i ate an apple.
So in this case number 1 is the correct sentence because outgoing is a vowel word and must use "an" instead of "a".

all vowels except the long vowel u
a university
a universe
a useful ....

no.2 is must be the correct one.
Because it starts with ' o ' and its pronunciation is also the ' o ' sound.