Final answer:
The correct parenthetical (in-text) citation for a summary of a section of a journal article with two authors with the same last name is option d: (J. Carlton & E. Carlton 245).
Step-by-step explanation:
The correct parenthetical (in-text) citation for a summary of a section of a journal article with two authors with the same last name would be option d:
(J. Carlton & E. Carlton 245).
When citing a work with two authors, both authors' names should be included in the parentheses, separated by an ampersand (&). This citation format helps to differentiate between authors when they have the same last name.