I have been pmed a sentence to explain. here is the sc.

In 1791 Robert Carter III, one of the wealthiest plantation owners in Virginia, stunned his family, friends, and neighbors by filing a deed of emancipa¬tion, setting free the more than 500 slaves who were legally considered his property.

(A) setting free the more than 500 slaves who were legally considered
(B) setting free more than the 500 slaves legally considered as
(C) and set free more than 500 slaves, who were legally considered as
(D) and set free more than the 500 slaves who were legally considered
(E) and he set free the more than 500 slaves who were legally considered as


See the following sentences:
1. I have bought x, y, and z and have helped the poor with those things. ----Correct.
2. I have bought x, y, and z, and have helped the poor.---Incorrect
= Here, the subject is I, and it has two verbs: bought and helped. These two verbs should not be separated by comma before and.
3. I have bought x, y, and z, and I have helped the poor.---Incorrect.
= Here, there are two errors: 1) 'Comma + and' has been sued to separate tow verbs of the same subject; 2) The subject has been unnecessarily repeated.
4. Considered X Y-is the correct idiom. NOT "Consider X as Y"

So A is correct.


Guys, if you think that there is another plausible explanation on this one, please explain.

thanks.