Music acts as a __ for babies to develop their senses. A. stimulate B. stimulus C. stimulating D. stimulated

The correct answer is **B. stimulus**.<br /><br />Here's why:<br /><br />* **Stimulus** is a noun that refers to something that causes a reaction or response. <br />* **Stimulate** is a verb meaning to encourage or inspire activity.<br />* **Stimulating** is an adjective describing something that encourages or inspires activity.<br />* **Stimulated** is the past participle of the verb "stimulate".<br /><br />The sentence needs a noun to complete the phrase "a __ for babies to develop their senses." Therefore, "stimulus" is the most appropriate choice. <br /><br />The sentence would read: "Music acts as a **stimulus** for babies to develop their senses." <br />