Question

the research paper, along with the graphs and charts, were submitted late.
○ sentence fragment
○ pronoun case
○ subject - verb agreement
○ no error

Explanation:

The sentence is "The research paper, along with the graphs and charts, were submitted late." When a phrase like "along with" is used, the subject-verb agreement is determined by the main subject (here, "The research paper", which is singular). But the verb used is "were" (plural), so there's a subject - verb agreement error.

Answer:

Subject - verb agreement