Question

it was____ accident that she feel down​

Answer 1

Answer:

It was an accident that she fell down.

Answer 2

It was an accident that she feel down.

RULE : The choice between the two indefinite articles – a & an – is determined by sound. Words beginning with consonant sounds precede ‘a’ and words beginning with vowel sounds precede ‘an’.

[ it's just a rule which is applicable for ur question ]

HOPE IT HELPS !!!