The correct option is A. A theory changing because a new scientific method was developed.
Explanation:
A scientific theory can be described as wide explanations for a phenomenon to occur. Scientific theories can be proven wrong whenever advancements are made and modern researches show that those theories were false. In contrast to this, a scientific law when made never changes. A scientific law is just a statement whereas a theory is a wide explanation of observations.
The experiments before Mendel were hence, theories which were subjected to change upon further research.
