Consider the following plants: 1. Bougainvillea 2. Carnations 3. Cocoa 4. Grapes Which of these plants are propagated by stem cuttings?

1. The question asks which of the listed plants are propagated by stem cuttings. 2. Stem cutting is a common method of vegetative propagation where a piece of stem is cut and induced to root. 3. Bougainvillea (1) is very commonly and easily propagated using stem cuttings. 4. Carnations (2) are also frequently propagated commercially through stem cuttings (specifically terminal cuttings). 5. Cocoa (3), while often grown from seeds or grafting, can also be propagated using stem cuttings, particularly semi-hardwood cuttings, although it might be more challenging than the others. 6. Grapes (4) are widely propagated using hardwood stem cuttings. 7. Since all four plants can be propagated by stem cuttings (to varying degrees of ease and commonality), option D (1, 2, 3 and 4) is the correct answer.