Respuesta :
Use the method of Deduction. Place each option in the blank space and read the sentence to see if it makes sense.
Example "Did you have forgotten about the extra bags in the trunk of the car"
Does not make sense.
Example "Did you have forgotten about the extra bags in the trunk of the car"
Does not make sense.
The correct answer is B, forget, because after did, you should always use the bare infinitive (to forget is the full infinitive, bare infinitive is just 'forget', omit 'to).