(单选题)胚内中胚层形成后,在脊索左右两侧,由内向外依次为
选项：

A:间介中胚层、轴旁中胚层,侧中胚层
B:轴旁中胚层,间介中胚层、侧中胚层
C:轴旁中胚层、侧中胚层、间介中胚层
D:间介中胚层、侧中胚层、轴旁中胚层
E:侧中胚层,轴旁中胚层、间介中胚层