To solve this problem, we need to identify which plants exhibit axile placentation. Axile placentation is a type of placentation where the ovules are attached to a central column in a multilocular ovary. Let's analyze the options:$\newline \bullet$Option 1: Mustard, Cucumber, and Primrose$\newline$ - Mustard: Shows parietal placentation.$\newline$ - Cucumber: Exhibits parietal placentation.$\newline$ - Primrose: Has free central placentation.$\newline$ - Therefore, none of these have axile placentation.$\newline \bullet$Option 2: China rose, Beans, and Lupin$\newline$ - China rose: Exhibits axile placentation.$\newline$ - Beans: Show marginal placentation.$\newline$ - Lupin: Has marginal placentation.$\newline$ - Only China rose has axile placentation.$\newline \bullet$Option 3: Tomato, Dianthus, and Pea$\newline$ - Tomato: Exhibits axile placentation.$\newline$ - Dianthus: Has free central placentation.$\newline$ - Pea: Shows marginal placentation.$\newline$ - Only Tomato has axile placentation.$\newline \bullet$Option 4: China rose, Petunia, and Lemon$\newline$ - China rose: Exhibits axile placentation.$\newline$ - Petunia: Has axile placentation.$\newline$ - Lemon: Exhibits axile placentation.$\newline$ - All three plants have axile placentation.$\newline$Therefore, the correct option is Option 4: China rose, Petunia, and Lemon.