Five sentences related to a topic are given below. Four of them can be put together to form a meaningful and coherent short paragraph. Identify the odd one out.

1) Displacement in Bengal is thus not very significant in view of its magnitude.
2) A factor of displacement in Bengal is the shifting course of the Ganges leading to erosion of river banks.
3) The nature of displacement in Bengal makes it an interesting case study.
4) Since displacement due to erosion is well spread over a long period of time, it remains invisible.
5) Rapid displacement would have helped sensitize the public to its human costs.

On reading the sentences, we can infer that the paragraph revolves around the displacement of people in Bengal due to erosion. 3 should be the opening sentence since it introduces the topic of discussion - displacement in Bengal. 3 should be followed by sentence 2 since it elaborates that the displacement is due to the shifting of the course of the Ganges and the erosion. We have to decide the pair between 5, 4, and 1. 

Sentence 4 is definitely a part of the paragraph since it fits well with both the sentences. Also, it states an important detail - the displacement is spread out over a period of time and hence, remains invisible. Since the displacement is not rapid, its magnitude is not significant. Sentences 4 and 1 form a pair and hence, sentence 5 is the one out of context.