Answer:
Option B. Complements
Explanation:
option A, Substitutes: The memory card is not a "substitute" to the camera, because the memory card cannot replace or carry out the function of the camera.
A substitute is a person or thing acting or serving in place of another. Cameras and memory cards need each other.
Option C, Unrelated: The camera needs the memory card to be used (function effectively) therefore, the are not two isolated objects not having any connection.
Option D. Elastic: This does not really show any relationship between both objects and is completely out of point in relation to the question.
Option B, Complements: This is the correct answer, because complement means to to help make something or someone more complete or effective. some examples are:
