We need to conserve our resources to buy ourselves time so scientists can find new solutions to our problems.
选项：

A:we should conserve our resources. If we do so, the money we save will be used to find new solutions to our problems.;
B:we should conserve our resources. If we do so, the resources will probably last long enough for scientists to find new solutions to our problems.;
C:we should conserve our resources. If we do so, we are buying time to find new solutions to the problems.;
D:we should conserve our resources. If we do so, scientists will have the money to buy more time so that they can find new solutions to the problems.