It is enter 4 the given name is Rose ux Almon D.
Ux is the Latin term for wife. Rose Malloch is the wife of Almon D. Index Almon D. in the Given Name field and leave the Surname blank. We do not assume the surname of person #2 from the surname of person #1.
Taking a poke around the document, two things: we do not index a surname by itself (under Project Instructions/What To Remember About This Project: Do not index a surname by itself that has no other information on the image.) and the word "do" is a variation of the word "ditto", so there's no need for the second James Mallion.