Answer:
Self-Promotion.
Step-by-step explanation:
The advancement barrier for Norma was Self-promotion. Most people shy away from taking credit and promoting themselves. But when an opportunity comes to promote oneself in the workplace, one should grab it.
But this self-promotion should be done healthily and not by criticisnig others, or seizing others opportunity or taking credit of others work.
In the given case, Norma had a good opportunity to promote herself and show herself worthy of the promotion that's coming soon. But she shied away to do so.
So, the correct answer is self-promotion.