(well) I don’t think I will be home before 6 pm. In this sentence “well” is

(well) I don’t think I will be home before 6 pm. In this sentence “well” is
A: Adverb
B: Adjective
C: Interjection
D: None of these

“Well;” used at the start; functions as an interjection (discourse marker). It signals hesitation or transition. As an adverb; “well” would modify verbs (e.g.; “sing well”).