Final answer:
The ukulele business has been growing at a rate of c) 50-60% in recent years.
Step-by-step explanation:
The subject of this question is Business and it is suitable for High School level students.
In recent years, ukulele manufacturers such as Kala have reported a growth of 50-60%. This means that the ukulele business has been experiencing a significant increase in sales and popularity.
For example, if Kala reported a growth of 50%, it means that their sales have increased by half. If they reported a growth of 60%, it means that their sales have increased by more than half, nearing a two-thirds increase.