Which Trait Is the Best Example of an Adaptation

Which trait is the best example of an adaptation?

A) A mutation resulting in weak branches in a species of tree that lives in windy regions
B) A mutation resulting in a heat- resistant enzyme in a bacterium living in a hot spring
C) A longer tongue in an insect- eating mammal that feeds on insects that live in shallow burrows
D) A new mutation that confers Tay- Sachs disease in humans
E) A shorter neck in a giraffe that lives in an area with many rival males and tall trees