Select sentences in the article that are based on opinion

Experiments were conducted to try to teach chimpanzees sign language

Which best describes the author's purpose in these frames of iqbal? to describe to the reader what happened at the wedding to show iqbal's pain and confusion after his debt increased to inform the reader about how iqbal escaped from the factory to persuade the reader to pay off the debt of child laborers

Aprimary source: a- may be biased b- is never biased c- cannot possibly have bias d- none of the above