[单选题]
Light of wavelength 580 fh.lztf zyn;-* k .peo0h 5 nc6yf8wl/nm is incident on nrsx ic e2*ihau8bc7370bwubhm) l((a slit of width 0.300 mm. An observing screen irhh078 ub3i)nslcwe*m ((i7b uac2bxs placed 2.00 m from the slit. Find the width of the central maximum.
A. $0.26 \; mm$
B. $1.9 \; mm$
C. $3.9 \; mm$
D. $7.7 \; mm$