Answer:
D. Nationalists
Jiang Jieshi served as leader of the Republic of China. He led the Nationalists against the rising Communist forces.
Explanation:
Commander in chief of the National Revolutionary Army (from which he came to be known as Generalissimo), he led the Northern Expedition from 1926 to 1928, before defeating a coalition of warlords and nominally reunifying China under a new Nationalist government.