The biggest threats to the Christmas Island crabs at the time of their annual immigration are the automobiles on the roads. Therefore, the option C holds true.
What is the significance of Christmas Island crabs?
The crabs that are mostly found near the Christmas Island are known as the Christmas Island crabs. Moreover, they often migrate to other part of the forest to lay their eggs during the winters.
While they need to migrate to other parts of the forest for laying and hatching their eggs, the highways and roads come between their points of commute. This, in turn, leads to threats to their life due to the trucks and other vehicles that pass through the highways and roads.
Hence, the option C holds true regarding the significance of the Christmas Island crabs.
Learn more about Christmas Island crabs here:
https://brainly.com/question/5186995
#SPJ6
