Final answer:
The anterior pituitary hormone with the broadest effect is Growth Hormone (GH), which stimulates cellular growth activities in a wide range of body cells.
Step-by-step explanation:
The anterior pituitary hormone that has a broader effect than the other pituitary hormones is Growth Hormone (GH). GH is responsible for stimulating cellular activities such as protein synthesis and overall growth. It impacts a wide range of body cells, which makes it have a more systemic effect compared to other anterior pituitary hormones like Thyroid-Stimulating Hormone (TSH), Prolactin (PRL), Adrenocorticotropic Hormone (ACTH), Follicle-Stimulating Hormone (FSH), and Luteinizing Hormone (LH), which have more targeted effects on specific glands or processes. The correct answer to the question is D. Growth Hormone.