Renu classified plants into groups as shown in the table shown here. Which of the following is the most appropriate headings for group X and group Y?
| X | Y | |
|---|---|---|
| A | Aquatic plants | Parallel |
| B | Heterotrophs | Autotrophs |
| C | Non-flowering plants | Flowering plants |
| D | Parasitic plants | Insectivorous plants |