Fewer children are interested in learning how to play a musical instrument, and young people have less interest in owning cars. these two trends are examples of forces at work.
a. politicalb. socioculturalc. legal

Socio-cultual forces

Explanation:

In simple words social and cultural forces refers to the factors such as life style, beliefs and values etc. that run in a society and shape the overall structure of communities living in such society.

These factors, directly and indirectly, impacts the business opportunities and activities as they can lead as a major determinant for the demand of certain variety of goods. For example- a country in which eating beef and pork are considered to be religiously unethical, one can sell other kinds of meat like chicken.

Thus, from the above we can conclude that the given case depicts socio-cultural forces.