Light Is Incident on a Double-Slit $\degree$ From the Central Maximum $\mu$

Light is incident on a double-slit.The fourth bright band has an angular distance of 7.0 $\degree$ from the central maximum.What is the distance between the slits (in $\mu$ m) ? (Assume the frequency of the light is 5.4 *10¹⁴ Hz. )

A) 27
B) 21
C) 24
D) 18
E) 14