Final answer:
Scientific evidence, utilizing both inductive and deductive reasoning, is used in a systematic study to determine cause and effect relationships.
Step-by-step explanation:
To determine cause and effect relationships in a systematic study, the best approach is the use of scientific evidence. This involves the use of both inductive and deductive reasoning. Inductive reasoning involves making broad generalizations from specific observations, whereas deductive reasoning starts with a general statement or hypothesis and examines the possibilities to reach a specific, logical conclusion. The Scientific Method embodies this process through observation, hypothesis formulation, experimental design, data collection, and analysis to validate or refute a hypothesis.