In advanced English morphosyntax and categorical lexical analysis, the functional categorization of words depends heavily on their syntactic distribution, morphological derivation, and contextual valency rather than purely on semantic definitions. Consider the following four advanced propositions regarding parts of speech (nouns, pronouns, adjectives, and adverbs) and their identification: I. A word that typically functions as a descriptive adjective (e.g., 'fast', 'hard', 'late') can undergo zero-derivation (conversion) to function as an adverb of manner without any morphological suffixation, retaining identical spelling while shifting its syntactic head-modification from a nominal phrase to a verbal or adjectival phrase (e.g., 'He drove very fast'). II. The indefinite pronouns 'one', 'none', and 'some' possess distinct pronominal properties that allow them to head noun phrases independently; however, 'one' can function as a generic third-person pronoun, a numerical head, or a prop-word substituting for an entire previously mentioned nominal projection, whereas 'none' can govern either singular or plural verb agreement depending on formal stylistic preference and semantic notional concord. III. Intensive and reflexive pronouns share identical morphological suffixes ('-self' / '-selves'), but they are syntactically distinct: reflexive pronouns are argument-bound anaphors required by the valency of the governing predicate where the antecedent and the object occupy distinct theta-roles within the same clause, whereas intensive pronouns are non-argument adjuncts (appositive nominal modifiers) that emphasize a referent and can be omitted without violating core clause grammaticality. IV. When an -ing participle form appears pre-nominally preceding a noun, it invariably functions as an attributive adjective if it admits degree modification by intensifying adverbs such as 'very' or 'more' (e.g., 'a very surprising development'), whereas if it retains pure verbal government and takes a direct object complement, it must be analyzed syntactically as a gerundial noun or participial adjunct outside the core adjectival category. Identify the option that correctly evaluates the morphosyntactic, categorical, and theoretical validity of propositions I, II, III, and IV according to standard English grammar and part-of-speech identification principles.