Answered

Which sentence does not contain any punctuation errors?

AMy brothers cleaned up washed dishes and put the leftovers in the refrigerator.
BMy brothers cleaned up, washed dishes, and put the leftovers in the refrigerator.
CMy brothers cleaned up, washed dishes, and, put the leftovers in the refrigerator.
DMy brothers cleaned up, washed dishes and put the leftovers in the refrigerator.

Verified Answer :

bobeld

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".

derequinho

The answer is 'b'You need to put commas  after all the tasks except after and where the last task is included

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