The elements that have chemical symbols that are two letters, with the first letter being "S," are silver (Ag) and tin (Sn). However, from the options you provided, neither of those choices is correct, as the pairs listed do not include silver.
Looking at the correct response based solely on the question criteria for elements with symbols starting with "S":
- Silver (Ag) - does not start with "S"
- Tin (Sn) - starts with "S"
Thus, the answer to the elements that fulfill the criteria exists but is not evident in the options.
If I have to infer from the context you gave, it seems you are asking for "tin and antimony." Antimony (Sb) does not fulfill the "S" requirement, thus:
None of the provided responses fit the criteria specified in the question.