Identify the sentence that has faulty parallel structure ...

A) The current epidemic of avian flu is a problem for farmers, for buyers, and for consumers.

B) The problem of truancy is of concern to parents, to teacher, and students.

The sentence that has faulty parallel structure is option B. To make it parallel should be to parents, to teacher and to students

Faulty parallelism is a construction in which two or more parts of a sentence are equivalent in meaning but not grammatically similar in form. Option B does not follow the same grammatical pattern