[Prep] 代词用法，求助一道题

绿豆0927

When drafting the Declaration of Sentiments that was adopted at the Seneca Falls Women's Rights Convention in 1848, included in it by the author, Elizabeth Cady Stanton, was a call for female enfranchisement.

• AWhen drafting the Declaration of Sentiments that was adopted at the Seneca Falls Women's Rights Convention in 1848, included in it by the author, Elizabeth Cady Stanton, was a call for female enfranchisement.
• BIncluding a call for female enfranchisement, a draft of the Declaration of Sentiments was adopted at the Seneca Falls Women's Rights Convention in 1848 that Elizabeth Cady Stanton wrote.
• CWhen the Declaration of Sentiments drafted by Elizabeth Cady Stanton was adopted at the Seneca Falls Women's Convention in 1848, a call for female enfranchisement had been included in it.
• DA call for female enfranchisement, included in Elizabeth Cady Stanton's draft of the Declaration of Sentiments in 1848, that was adopted by the Seneca Falls Women's Rights Convention.
• EWhen Elizabeth Cady Stanton drafted the Declaration of Sentiments that was adopted at the Seneca Falls Women's Rights Convention in 1848, she included in it a call for female enfranchisement.
  

正正确答案是E，我想问E中It难道有没有指代不清的问题吗？