Which of these statements most fully expresses why it is crucial to understand the basics of finance and economics?

$$ a$.$ Failure to understand and implement sound financial practices can lead to personal bankruptcy.

$$ b$.$ Failure to understand and implement sound financial practices led to the global financial crisis that started in $2008.$

$$ c$.$ Failure to understand and implement sound financial practices can lead to both personal and global financial collapse.

d$.$ Failure to understand and implement sound financial practices can lead to the failure of start$-$up companies and personal banklruptcy