In this case, "each group member" is the appropriate choice to maintain a consistent singular reference, as "the students" refers to all members of the class. "Each group member" indicates the singular responsibility of outlining their roles, following the conventions of Standard English.

In this case, "he or she" is the appropriate pronoun-antecedent agreement because "each artist" refers to a singular form. Using "he or she" maintains a consistent singular reference and aligns with the conventions of Standard English.

The correct choice of pronoun-antecedent agreement is "one of them" because it refers to either Lena or Olivia in a singular manner while maintaining consistency in reference and adhering to the conventions of Standard English.

In this case, "some of their" is the appropriate choice to maintain a consistent reference when referring to the doubts of multiple students. "Some of their" aligns with the conventions of Standard English.

In this case, "each person" is an appropriate choice to maintain a consistent singular reference, as "everybody" refers to all individuals. "Each person" indicates the singular responsibility of each individual present at the meeting to be on time and prepared. This option aligns with the conventions of Standard English.