Question

the pronoun in bold is not vague. select its one clear antecedent. johannes gutenberg is known for inventing the movable - type printing press. his creation sparked a revolution in printing that made books more accessible to the public.

Explanation:

The possessive pronoun "His" clearly refers to the person mentioned previously, Johannes Gutenberg. In the context, it is his creation (the movable - type printing press) that is being discussed.

Answer:

Johannes Gutenberg