The correct answer is D. continue.
The District Collector is saying that the government cannot continue to support these schemes for a long time. This means that the government cannot keep providing money or resources to these schemes indefinitely. There are a few reasons why the government might not be able to continue to support these schemes. One reason is that the government might not have enough money to keep funding them. Another reason is that the government might decide that the schemes are not effective and that the money could be better spent on other things.
The other options are not correct because they do not accurately reflect what the District Collector is saying. Option A, pay, is not correct because the District Collector is not saying that the government cannot afford to pay for these schemes. Option B, succeed, is not correct because the District Collector is not saying that the government is not succeeding in these schemes. Option C, manage, is not correct because the District Collector is not saying that the government is not able to manage these schemes.