Answer: A) Miguel or Suri are going to the library this evening.
Explanation: Subject-verb agreement means the subject and verb must have the same number (both singular or both plural). When we have compound subjects (subjects joined by "and," "or" or "nor") we need to be careful, when two or more subjects are joined by "and" the verb must be in plural form. When two or more subjects are joined by "or" or "nor" the verb must be in singular form. The correct sentence (option A) would be: Miguel or Suri is going to the library this evening.