This is a multicolinearity problem and the student should determine the variable(s) that cause(s) the problem and remove it.
Explanation:
This information means that there exists a linear combination between the independent variables. The problem might have developed due to multicolinearity producing almost perfectly linearly dependent columns.
This could also be as a results of single matrix created when the student use an incorrect indicator variables and included an additional indicator column which created linearly dependent columns.
The answer is "Slide Sorter view". Some of the online courses say that all words must be spelled correctly and in the correct order, so if you don't have exactly what they want they will mark it as "wrong".