Which of following statements about career management is true?

If your choices are the following:

A Economic factors and new technologies often lead people to change occupations.

B Most people remain in the same position for their entire working lives.

C It's very rare for people to move to a different company during their careers.

D Changing occupations always means developing an entirely new set of job skills.

Then the answer is A Economic factors and new technologies often lead people to change occupations.