The key of the given piece of music can be found to be 3) minor
How to find the key ?
Minor keys tend to have a darker, more somber sound than major keys. They are often used to express emotions such as sadness, melancholy, or anxiety. Major keys, on the other hand, tend to have a brighter, more cheerful sound.
One way to determine the key of a piece of music is to look for the most frequently used chords. In minor keys, the minor tonic chord (the chord built on the first scale degree of the minor scale) is usually the most frequently used chord.