Answer and explanation:
Since this is not a multiple-choice question, I'll provide you directly with an answer that is also an explanation of the term "glass ceiling".
The phrase "glass ceiling" is used to refer to a barrier that is physically invisible, yet real, a barrier that prevents people belonging to a certain demographic to achieve higher positions - to climb up the corporate ladder. The people affected by a "glass ceiling" are minorities -- women, immigrants, African Americans etc. An example with the phrase is as follows:
- You would think things would be better by now. But the company where Joan works still has a glass ceiling... It looks like she'll never get to CEO.