**Answer:**

**Step-by-step explanation:**

**Given**

Let the three sides be a, b and c

Such that:

**Required**

Find c such that a, b and c do not form a triangle

**To do this, we make use of the following triangle inequality theorem**

**To get a valid triangle, the above inequalities must be true.**

**To get an invalid triangle, at least one must not be true.**

**Substitute: **

**The results of the inequality is: **** and **

**Rewrite as: ** and ** **

**This means that, the values of c that make a valid triangle are 1 to 9 (inclusive)**

**Any value outside this range, cannot form a triangle**

**So, we can say:**

**, since no options are given**