Michael works at an accounting firm. he and his colleague, ava, are both eligible for a promotion to a particular role. michael works very hard, but he feels that ava will be promoted as she is more sincere and dedicated to her job. however, michael gets promoted even though ava was a more deserving candidate. this scenario illustrates the concept of

 Glass ceiling

Explanation: Glass ceiling is a metaphorical term that describes about hidden and unbreakable obstruction that is usually faced by women in the professional field.They are restricted from reaching the promotions or higher post even though they do their job with dedication, on-time and responsibly.

The achievement ,rewards, qualification etc of women are not considered for the upgradation of their post rather men are preferred for the higher post.

The situation of Ava is depicting about glass ceiling because even though she is hardworking ,dedicated and more deserving towards her work ,higher post is assigned to Michael because he is a male employee .