Given that all of the choices are true, which one is most relevant to the focus of this paragraph?

Although William Godwin remarried in 1801, (3) his new wife was kind enough, and her relationship with inquisitive, curious-minded Mary grew increasingly strained as Mary got older.

The most relevant choice to the focus of this paragraph is (3) his new wife was kind enough, and her relationship with inquisitive, curious-minded Mary grew increasingly strained as Mary got older.