Though somewhat less than previous chapters and suffering from a minor rash of academic jargon, the final chapter of the book is nonetheless laypeople.

(a) arcane
(b) coherent
(c) subjective
(d) largely ignored by
(e) accessible to
(f) impenetrable to

C  and   E

Explanation:

Though somewhat less subjective than previous chapters and suffering from a minor rash of academic jargon, the final chapter of the book is nonetheless accessible to laypeople.

basic principle: a pronoun usually refers to something earlier in the text (its antecedent) and must agree in number — singular/plural — with the thing to which it refers. the indefinite pronouns anyone, anybody, everyone, everybody, someone, somebody, no one, and nobody are always singular.