The adaption when sand mason worms have to survive their environment should be stick out the tube to feed.
It is the sum of the total elements, factors and the conditions that helped with the surrounding which create an effect on the development, action, or survival with respect to an organism or the group of an organism.
Based on the above explanation, we can conclude that the correct option is a.
Learn more about an environment here: https://brainly.com/question/21711085