Which Destiny's Child album has sold most copies?

Explanation

The girl band Destiny's Child is an American R&B girl band formed in 1997. Its best known member is probably Beyoncé Knowles, who formed alongside Kelly Rowland and Michelle Williams. Their no. 1 top singles include "Bills, Bills, Bills", "Say My Name" and "Survivor". Their best selling album was "The Writing's on the Wall" (1999). They are among the best selling girl bands ever. The band dissolved in 2005.