在单缝夫琅禾费衍射实验中，若增大入射光波长，其他条件不变，则中央明条纹:In the single slit Fraunhofer diffraction experiment, if the wavelength of incident light is increased and other conditions remain unchanged, the central bright stripe will
选项：

A:宽度变小derease the width;
B:宽度变大inrease the width;
C:宽度不变，且中心强度也不变keep the width and the central intensity;
D:宽度不变，但中心强度增大keep the width, but increase central intensity