Answer:
Based on the sentence, "dooming" means that not teaching cursive in third grade will cause every child to write at a second-grade level, and therefore, it will restrict their ability to write at an advanced level. Therefore, the correct answer is "restricting."
Step-by-step explanation:
The word "dooming" in this context means that without learning cursive in third grade, children will be unable to develop their writing skills beyond a second-grade level. The author is suggesting that learning cursive is important for developing children's writing abilities and that failing to teach it early on could be detrimental to their progress.