A study of over $100,000$ people who took a personality test online found that as people age they generally become ${?}^{\text{t}\text{h}\text{e}}$

a$)$ less conscientious, extraverted, and agreeable.

b$)$ more aggressive, less agreeable, and less responsible.

c$)$ less optimistic, extraverted, and humble.

d$)$ more responsible, organized, and focused.