Final Answer:
The size of the head relative to the rest of the body increases as development progresses. The correct option is (A) "Increases.
Step-by-step explanation:
The Size of the Head: The correct option is (A) "Increases." This implies that, as an organism develops, the head becomes proportionally larger compared to the rest of the body.
Development Progresses: This refers to the growth and maturation of an organism over time. During this process, various changes occur in the body's proportions.
Increasing Proportions: The statement indicates that the head's size grows in relation to the body. This phenomenon is commonly observed in vertebrates during their developmental stages.
The correct option is (A) "Increases.