[单选题]
Light of wavelength -4ai g64eurkz m a2b0*co7mul580 nm-uf(/q/qbxnqh cg g3i**lq0p is incident on a slit of width 0.300 mm. An observing screen is placed 2.00 m from the slit. Findg/q(u *qbl fp3 gh-c*i0nqq/ x the width of the central maximum.
A. $0.26 \; mm$
B. $1.9 \; mm$
C. $3.9 \; mm$
D. $7.7 \; mm$
