The correct answer is D. The dogs know several commands that take the obedience class.
Step-by-step explanation:
A misplaced modifier occurs if a modifier (an element that describes a word) is placed incorrectly which often occurs if the modifier is far from the word it describes. This type of error often leads to confusing sentences.
The sentence "The dogs know several commands that take the obedience class" contains a misplaced modifier because the phrase "that take the obedience class" should describe "the dogs" as "the dogs that take the obedience class" but in this case, due to its location in the sentence, it describes "the commands". This means the modifier has been separated; and as a result, the sentence is unclear.