Question

which sentence states a fact?
although mary shelley published frankenstein anonymously, her husband percy shelley wrote the introduction.
it is unfortunate that mary shelley could not publish frankenstein under her own name.

Explanation:

A fact is a statement that can be proven true or false with evidence. The first sentence provides verifiable information about the publication of Frankenstein (Mary Shelley publishing it anonymously and Percy Shelley writing the introduction). The second sentence expresses an opinion (using "unfortunate") rather than stating a fact.

Answer:

Although Mary Shelley published Frankenstein anonymously, her husband Percy Shelley wrote the introduction.