[单选题]
Light of wavelength 580 nm is inci/dxmk l/6nw;(fy xl /udent on a slit of width 0.300 mm.lyp1ivjx yxagw:;lz40c9 q8bo jp(uw10b2l 6 An observing screen is placed 2.00 m from the :voj1; bxp4 w9a6gq u1c p0zi(y0ll 8x2wbyljslit. Find the width of the central maximum.
A. $0.26 \; mm$
B. $1.9 \; mm$
C. $3.9 \; mm$
D. $7.7 \; mm$