The last one is the answer
The answer is c because “they’re” is “they are” so it would be correct to use that one
The answer that corrects the shift in verb tense in the given sentence above is: To earn his allowance this week, Josh must mow the lawn and trim the bushes. The correct answer is option D. This sentence shows a condition therefore, the verbs that should be used is in the present form.
I do it is possible,if you believe something but the other side of the argument has more evidence or logically make more sense, you would still argue because it is your opinion and your belief, therefor you would want to explain it.