大全320，查了以前的帖子，没有得到想要的答案

From the bark of the paper birch tree the Menomini crafted a canoe about twenty feet long and two feet wide, with small ribs and rails of cedar, which could carry four persons or eight hundred pounds of baggage so light that a person could easily portage it around impeding rapids.

(A) baggage so light

(B) baggage being so light

(C) baggage, yet being so light

(D) baggage, and so light（E）

(E) baggage yet was so light

答案是E ，我想问的是was的主语是和which 一样是canoe 吗？ 如果是怎么中间没有逗号就直接接在which后面？这是什么奇怪的结构？yet在这里起的是什么作用 ？

谢谢楼上, 不过即使做连词, WAS 到底是谁的谓语啊 ? 对整个句子的结构和意思我还不是很理解, 能不能讲清楚点, 千万别嫌我烦哦, 嘿嘿