The correct answer is b. The verb tenses shift.
This is because the tenses don't match, meaning that at first you have a present simple and then a past simple. In order for them to be consistent they should be in the same tense.
No, sorry. It's not sorry if I didn't help
Answer:
Grave error
Explanation:
The author clearly has a bias towards keeping the vacant lot as it is by providing the objections of the nearby residents. He even used the words: "Grave error" himself.