Sentence 1: Most conflicts intensify because people do not deal with problems open and honestly.
Which of the following options would CORRECT sentence 1?

This sentence contains a parallelism error. Words or phrases within a sentence that are similar (parallel) in meaning or in structure should be written as such. Therefore, \u201Copen\u201D should be written as \u201Copenly\u201D to become parallel with the use of \u201Chonestly.\u201D The other answer options are not options that would make the sentence grammatically correct.