SC : Tenses (stuck b.w 2 options)

[vikram4689]

Before the Civil War, Harriet Tubman, along with other former slaves and white abolitionists, helped create what had become known as the Underground Railroad, and were responsible for leading hundreds, if not thousands, of slaves to freedom.
had become known as the Underground Railroad, and were
would become known as the Underground Railroad, and were
had become known as the Underground Railroad, and was
has been becoming known as the Underground Railroad, and was
would become known as the Underground Railroad, and was


I am confused b/w C and E, A&B are eliminated due to was/were, D seems awkward to me

[vikram4689]

Please reply . . . .

[CHANDEEP_SODHI]

Please reply . . . .

Vikram , learn to use google .Thats the easiest and the fastest way to solve problems . Please refer to the link below

before-the-civil-war-harriet-tubman-along-with-t4295.html