Final answer:
The sentence "The individuals holding the petition asked my husband and I to sign the petition" contains an error of improper pronoun case; the correct form should be "my husband and me" as they serve as objects in the sentence.
Step-by-step explanation:
To determine if there is a pronoun case error, replace "who" with "he" and "whom" with "him". If the antecedent is plural, replace "who" with "they" and "whom" with "them". Here is an example sentence: Justin, who is my teacher, knows when to use "whom" correctly. So, the sentence is saying that Justin is my teacher.
The error that needs to be corrected is improper pronoun case. In the sentence "The individuals holding the petition asked my husband and I to sign the petition," the pronoun I should be in the objective case because it is functioning as an object.
The correct pronoun should be me, making the sentence read, "The individuals holding the petition asked my husband and me to sign the petition." It is a common mistake to use a subject pronoun like I instead of an object pronoun like me in compound structures that serve as objects and after prepositions.