Respuesta :
Correct answer: C). It involves research over a long period of time to prove a phenomenon
A scientific theory may be defined as the process that includes different ways that are used by the scientist to find out about the natural world. It is a well-sustained explanation of the natural world that is acquired by scientific method with repeatedly tested and confirmed, the predefined protocol of observation and experiments.
It takes many years to prove a scientific phenomenon after several experiments and many years of research.
Hence, the correct answer would be option C.