I’m guessing it wants you to fill in two major key signatures like D major and C major also with two minor key signatures like A minor and B minor. I picked those key signatures because A minor is the same as C major but it starts on A and D major and B minor is the same but it starts on B
To judge whether or not you are a motivated person who aims to push yourself to your fullest potential.
It should be 106 symphonies but just answer 107 symphonies.