Adverbial phrases provide circumstantial information, and their specific placement at the beginning of a sentence can trigger syntactic changes like subject-auxiliary inversion. Analyze the assertions below regarding negative adverbials and inversion:
I. Fronting negative adverbials like "Under no circumstances" or "Seldom" requires subject-auxiliary inversion (e.g., "should you go").
II. Adverbials of frequency always trigger inversion when placed at the beginning of the sentence (e.g., "Sometimes go I").
III. "Little did he know" is a fixed phrase exemplifying negative inversion used for dramatic or emphatic effect.
Select the correct analysis: