The correct answer to this open question is the following.
You did not include the previous activity, so we do not know what you are talking about. However, we can comment on general terms about the relevance of the word INSTRUMENTAL.
In simple terms, instrumental means something that has the utmost importance in the consequence of something. For instance, the performance of an individual on any given task. If the individual makes a great contribution, accomplished many things in the company, it is said that its performance was instrumental to accomplish the goals.
When we use the word instrumental we are using an adjective to refer to something that was "very important" or "determinant."
