Question: Choose the correct idiom to complete the sentence: \'After months of hard work, she finally got the promotion she had been working for; it was a case of __________.\'

Options:

1. burning the midnight oil
2. the early bird catches the worm
3. a blessing in disguise
4. the proof of the pudding is in the eating

Correct Answer: the early bird catches the worm

Solution:

The idiom \'the early bird catches the worm\' fits as it implies that her hard work and early efforts led to her success.