The correct answer is option 3, Nepenthes. Nepenthes, commonly known as pitcher plants, are insect-catching plants. They have specialized pitcher-shaped leaves that contain a liquid to attract and trap insects. When an insect lands on the rim of the pitcher, it may slip and fall into the liquid-filled cavity where it is unable to escape. The digestive enzymes produced by the plant break down the insect and absorb the nutrients. This adaptation allows the Nepenthes plant to supplement its nutrient intake, as these plants often grow in nutrient-poor environments. Australian Acacia (option 1) and Smilax (option 2) are not typically considered insect-catching plants. Nerium (option 4), also known as oleander, is toxic to insects, but it does not actively trap them.