Final answer:
A scientific law is a descriptive, generalized body of observations in science, often expressed mathematically, that describes relationships between phenomena and is supported by substantial evidence. option a.
Step-by-step explanation:
The descriptive, generalized body of scientific observations that you're asking about is best represented by a scientific law. Unlike hypotheses or theories, a law does not attempt to explain why something happens, but rather describes the relationships between different phenomena, often in a concise mathematical form. Laws emerge from extensive observational studies and are typically supported by a large body of experimental evidence. One well-known example is Newton's Law of Universal Gravitation, which mathematically describes the attraction between two objects based on their masses and the distance between them.