Which of the following can be threats to the biodiversity of a geographical area ?

Which of the following can be threats to the biodiversity of a geographical area ?
1. Global warming
2. Fragmentation of habitats
3. Invasion of alien species
4. Promotion of vegetarianism
(a) 1, 2 and 3 only
(b) 1, 2 and 4 only
(c) 3 and 4 only
(d) 1, 2, 3 and 4

Answer is (A)