This is true. You shouldn't split your infinitives unless necessary for grammatical reasons, while splitting them to add a modification in the middle creates a weird, awkward sentence.
Please give us a question.
Answer:
D) It provides supporting evidence of the effect playing
music has on developing problem-solving skills.
You need another comma after the word "think" because it's a parenthetical expression and is set off from the sentence.
Answer:
My dad took the bags and rushed outside to the car.