Sea turtles migrate across thousands of miles of ocean before returning to nest on the same stretch of coastline where they hatched, but how they do this has mystified scientists for more than fifty years. Sea turtles likely go to great lengths to find the places where they began life because successful nesting requires a combination of environmental features that are rare: soft sand, the right temperature, few predators, and an easily accessible beach. From this passage it is safe to conclude that sea turtles
A、are not easily observed by scientists.
B、cannot lay their eggs on any beach other than the one on which they hatched.
C、will not lay their eggs on beaches with pebbly sand.
D、must have the ability to precisely detect their location.