Answer: a.The arguments between scientists tend to make theories stronger, not weaker.
Step-by-step explanation:
A scientific theory includes the explanation of cause of a natural phenomena. It includes a relevant methodology which was followed to obtain reason responsible for the cause of a natural phenomena.
a.The arguments between scientists tend to make theories stronger, not weaker. is the correct option because of the fact that the arguments bring changes in the content of the theory which is proved and postulated by suitable scientific methodology. This will make the content of the theory valid, accurate and reliable by the entire scientific society.