Which Trait Is the BEST Example of an Adaptation

Which trait is the BEST example of an adaptation?

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