Due to sluggish market conditions, the factory's workforce has ________ from over 4000 to a few hundred.
句意：由于市场不景气，工厂的劳动力从4000多人减少到几百人。proclaim 宣布；声明。dwindle锐减；缩小。repress压抑（感情）；镇压。indulge使（自己）沉迷于；放纵。根据句意可知，dwindled最为符合。故正确答案为B。