a). when I wake up, I start eating food, taking a shower and go to school
Explanation:
The above sentence has an error in the parallel structure sentence because parallel structure means to repeat a grammatical form within the sentence in the correct form. By making each and every term in the sentence to follow the same the same grammatical pattern, the sentence is said to be parrallelly constructed. The correct form is "When I woke up, I start eating food, takes a shower and then go to school."
