Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to the original sentence in each of the following questions. Unless people take action to

If people didn't take action to protect the environment, climate change would have worse.

If people took action to protect the environment, climate change were worse.

If people don't take action to protect the environment, climate change will be worse.

If people don't take action to protect the environment, climate change would be worse.