The correct choice is
D.What is the best angle to throw a ball for maximum distance
A) Incorrect . Since the which sport is fun varies person to person.
B) Incorrect. This question does not need a scientific investigation to be carried out to answer it. instead we can search the for the records of the pitcher of the last hundred years and then do a comparison.
C) Incorrect. This is more of general knowledge question
D) Correct. we can carry out a scientific investigation by throwing a ball at same speed and various angles and check at which angle does the ball travel the maximum distance.