Which of the following questions can be answered scientifically

In order for a question to be answered scientifically,  it need to require various of observations and experiments to answer and it have to be 100 % objective

Example of the question : Can planting cover crops Reduce Erosion ?

In order to find the answer of that question, we need various of observations and experiments to obtain the data that could be used as conclusion

Apresident can veto /reject a bill

Where are the options