Final answer:
Malala Yousafzai chose to volunteer for the BBC when she wrote an anonymous blog detailing her life under Taliban rule and advocating for girls' education.
Step-by-step explanation:
Malala Yousafzai volunteered to blog for the BBC after everyone else refused. The blog was an opportunity to provide the outside world with a glimpse of the struggles faced by girls trying to obtain an education in Swat Valley, Pakistan, under Taliban rule. Her contributions under a pseudonym highlighted the impact of the conflict on education and became a source of inspiration and awareness for millions of people around the world.