Correct option :

Steps to derive correct option :
Money Maria borrowed = $3000
Percentage of simple interest per annum = 4%
Time she took to repay the money she borrowed = 4 years
We know that :

In this case :
Principal = $3000
Rate = 4%
Time = 4 years
Which means. the simple interest :



Thus, the interest she has to pay = $480
We know that :

Then, the Amount Maria has to pay :


Thus, the amount Maria has to repay after 4 years = $3480
Therefore, the correct option is (b) $3480