When two or more subjects are joined by, verb form must be used in order to ensure subject-verb agreement. a. infinitive, b. participial, c. singular d. plural

B. Participial

Explanation:

When two or more subjects are joined by, a "Participial" verb form must be used in order to ensure subject-verb agreement.

- "the answers are a and b.  

when cullen speaks of planting while others reap, and standing "abject and mute," he is speaking about the racial injustices present in american society. as these injustices have changed over time, the american identity  has also shifted. those changes are, in turn, reflected in american literature."