Correct answer: (a) 2 3 4 1
Explanation
- A
2 3 4 1
(a) 2 3 4 1. Epiphytes crowd equatorial rainforest canopies; acacia (babul-type thorn) is keyed here to the Sahara’s arid fringe; baobab is the savanna landmark; cedars (Atlas/Lebanon type) belong to the Mediterranean. That code is the official key.
- B
2 3 1 4
(b) 2 3 1 4. It sends baobab to the Mediterranean and cedars to the savanna, reversing two unmistakable trees.
- C
2 4 3 1
(c) 2 4 3 1. Acacia is parked on savanna and baobab on the Sahara. The stored key keeps acacia on 3 (Sahara) and baobab on 4 (savanna).
- D
2 4 1 3
(d) 2 4 1 3. Cedars are dumped on the Sahara and baobab on the Mediterranean. Cedar is not a desert tree.
Summary. Official key is (a) 2 3 4 1. Epiphytes → equatorial (2), acacia → Sahara (3), baobab → savanna (4), cedars → Mediterranean (1). Do not move baobab off the savanna or cedar off the Mediterranean. Honour the stored letter (a).