Concept:
Alphabetical ordering is determined by comparing letters from left to right.
Step 1: Compare the spellings.
align*
Sycamore & Syc
Sycophant & Syc
Syllable & Syl
Syllabus & Syl
align*
Since ``c'' comes before ``l'', words beginning with ``Syc'' appear first.
Step 2: Arrange within each group.
Among Syc words:
Among Syl words:
Step 3: Final arrangement.
Step 4: Conclusion.
Hence, the correct order is: