What is the symbol of the element sulfur? 

All elements in a periodic table are represented by a symbol and all have a fixed position in the periodic table which is assigned as per their atomic number.

Till now, 118 elements are known to humans. Each element of the modern periodic table is designated with a specific symbol for its convenient use in chemistry.

Now, the given symbols represent-

• Se- Selenium. It belongs to group 16 and is a non-metal.
• Sr- Strontium. It belongs to group 2 and is a metal.
• Sp- It is not a chemical symbol of any element.
• S- Sulphur. It also belongs to group 16 and is just below oxygen in the periodic table.

Hence, the correct option is (D).