Macroenvironment forces can have an impact on an industry's performance. Which of these forces might be an explanation for the growth of the craft beer strategic group?

a$.$ The social forces of millenials as they seek to express individuality through their beer choice

b$.$ Political and legal forces limiting access to alcohol

c$.$ Aging population of baby boomers who are loyal to their beer brand

d$.$ Technological forces making it more expensive for companies to get into the beer industry