When a work has two authors with the same last name but different first names, how are they listed in works cited?

a. alphabetically by first name
b. alphabetically by last name and middle initial
c. alphabetically by the last name
d. alphabetically by the middle initial

Adam posted in a thread about theoretical physics. in his post he refuted general relativity and cited a paper that was recently self-published by one person on her own personal website and had no references to other works in the field.which important question did adam not answer sufficiently when evaluating the cited paper?

Iopened the door quietly,then stood in the doorway rewrite using ..ing participle

Can someone me with this english question