deepak268 wrote:
does option C mean : its actually the plant in tufe peninsula that grows and plant in tufe island does not change and thats why the difference in height??
No, actually the other way round. The island plants grow 40 cm less than the mainland plants. However the point is not which group grows more - it is the difference in growth that matters:
There are 3 environmental conditions discussed here:
1. Past: the environmental condition of the mainland (the island was a part of the mainland then).
2. Present: the environmental condition of the mainland.
3. Present: the environmental condition of the island.
The argument is:
Present: the plan height on island is different from plant height on main land ( the plants under conditions 2 and 3 are different).
However the reason for this difference is stated as the difference between 1 and 3 ( NOT 2 and 3!)... "
Tufe Island is significantly drier than Tufe Peninsula WAS". So it is assumed that condition 2 has not changed in the same way as condition 3.
Another approach (negation):
The mainland’s environment has
not changed. Thus the conditions 2 and 3 are same now, so there is no environmental reason that the heights would be different. Thus the argument breaks down.
Option C is hence correct.