Answer:
a. extemporaneous
Explanation:
Extemporaneous -
It refers to the method of speaking about a topic in a very fluent manner , without the help of any write up , is referred to as an extempore .
A person who is very good with the art of extempore , is referred to as an extemporaneous .
Hence , from the given scenario of the question ,
Joseph is described to as an extemporaneous person .
Bobby McFerrin’s Music is unusual because It’s good music, but the lyrics and the sounds just have an almost unexplainable feeling. Like that song don’t worry be happy. It sounds great but the way he sings it just sounds about unusual. This is kinda a hard one to explain so sorry if it sounds weird