Step 1: Understanding the Concept:
Breaking a scientific term into its word parts is often the fastest way to work out what it means, and that works well here. The word in question is built from "trans," meaning across or beyond, and "genic," relating to a gene.
Step 2: Key Approach:
Put those two parts together and "transgenic" literally means "carrying a gene brought across" from somewhere else, that is, a gene moved across the species barrier into a new organism using genetic engineering tools such as Agrobacterium-mediated transfer or a gene gun.
Step 3: Detailed Explanation:
A transgenic plant, then, is a plant whose own genome now permanently carries one or more genes taken from a different species, giving it a new trait such as pest resistance, herbicide tolerance, or better nutrition that it did not have naturally. The other listed names are not real scientific terms at all: "reacting plant" and "jeans plant" do not correspond to any biological concept, and "money plant" is simply the common name of an ordinary houseplant (Epipremnum), with no genetic modification involved.
Step 4: Final Answer:
A plant carrying an inserted gene from another species is called a transgenic plant by definition, so option 3 is correct.