Final answer:
The compound Be2Al(SiO3)2 contains four different elements: beryllium, aluminum, silicon, and oxygen.
Step-by-step explanation:
The question is asking us to identify the number of different elements present in the compound Be2Al(SiO3)2. Upon examining the formula, we can see the following elements: beryllium (Be), aluminum (Al), silicon (Si), and oxygen (O). Therefore, there are a total of four different elements in this compound, which corresponds to option C.