Aisha has a 401(k) retirement plan through her employer. She earns a salary of $70,000/year. Her employer will match her contributions dollar-for-dollar up to 5% of her annual salary. According to good old Uncle Al, what is the minimum amount that Aisha should have taken out of her paychecks to contribute to her 401(k) retirement plan each year?

A. $1,725
B. $3,500
C. $7,000
D. $18,000