Both B and D are correct forms - the last comma is optional.
I would use probably use a comma here because the brothers' tasks are so diverse. However, I am not forced to use it - it is optional.
I would not use it here:
I am considering a HP, Dell and Lenovo as possibilities for my next computer.
(Because they are not diverse - they are all brands of computers).
What's wrong with A - It sound as if your brothers dropped the dishes as they took them out of the dishwasher and had to clean up all those broken washed dishes.
C is wrong because of the unecessary common after the "and".
The answer is A. who and whom are personal pronouns
The King believes that Englishmen must be "the most pernicious race of little odious vermin that nature ever suffered to crawl upon the surface
Well standardized tests help show how students are learning so its shows how schools are performing and how teachers are teaching and what the student learned.
