The number in each question bleow is to be codified in the following code:
Digit 7 2 1 5 3 9 8 6 4
Letter W L M S I N D J B
->  64928

Answer: A. JBNLD

As given, 6 is coded as J,
4 as B,
9 as N,
2 as L    and
8 as D.
So, 64928 is coded as JBNLD.