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111.  Too old to bear arms himself, Frederick Douglass served as a recruiting agent, traveled through the North to exhort Black men to join the Union army.

(A) traveled through the North to exhort

(B) and he traveled through the North and exhorted

(C) and traveling through the North exhorted

(D) traveling through the North and exhorted（E）

(E) traveling through the North and exhorting

第一不明白A为什么是run-on，其次就是 traveled vs. travelling 二者选择的条件是什么，时态吗？

served 和 traveled两个动词, 没连词, 即为run-on. traveled在这不是表语.

traveling是状语, 伴随served, 动作发出者为FD.