The oil yielding plant among the options is sunflower.
Explanation: Sunflower seeds are harvested for their oil content, making it a commonly used cooking oil.
Why other options are incorrect:
Lentil: Lentils are a type of pulse, which are high in protein but not oil.
Cauliflower: Cauliflower is a vegetable, not known for producing oil.
Hibiscus: Hibiscus is a flowering plant primarily used for its decorative flowers, not oil production.