【正确答案】 B

【答案解析】 Parallelism; Rhetorical Construction
   As written, this sentence does not clearly indicate whether and is intended to conjoin two things that the foundation does (working to strengthen markets and cooperating with governments) or two things that the foundation works to accomplish (strengthening markets and cooperating with governments). The latter is less plausible because of the redundancy of works to cooperate. In the former, the proper verb form, parallel with the present-tense works, would be cooperates. In the latter, the proper verb form, parallel with the infinitive to strengthen, would be to cooperate or simply cooperate. Only one of the answer choices resolves the uncertainty of meaning in a coherent and well-formed way.
   A   Cooperating is incorrect, since it is not in the same form as either works or to strengthen.
   B   Correct. This version correctly represents the foundation's two actions by putting the verbs works and cooperates in parallel form. Cooperates... to improve is the most concise phrasing to express the purpose of improving access.
   C  Cooperate...for improvements of access for farmers is awkwardly phrased and unnecessarily wordy.
   D   Cooperate... and improve accessibility for farmers is awkwardly phrased and unnecessarily wordy.
   E   In cooperation destroys the parallelism required by works to: there should be a verb following works to, not this prepositional phrase.
   The correct answer is B.