Answer:
The correct answer is option C-how long does it take a paper bag to break down?.
Step-by-step explanation:
A scientific question is a question which can have the answer based on the observations and predictions based on which hypothesis can be derived.
This hypothesis must be well supported by the experiments on the basis of which reason can be suggested for the same observation.
In the given question "how long does it take a paper bag to break down?" approaches to answer the question about the "amount of time required to break the paper bag which can be tested experimentally based on the observations of which it can be answered.
Thus, option C is the correct answer.