We（）on it for many hours but we have not yet reached any conclusion.

A、要是你早先听了我的劝告去伦敦，现在就不会在纽约陷入这么惨的处境了。
B、要是你以前接受我的劝告离开伦敦，也不至于看到纽约现在这可怕的情景了。
C、要是你过去肯听从我的建议去伦敦，现在就不会在纽约，也就不会处于这么惨的环境。
D、如果你跟着我的建议走，去伦敦，就不会在纽约陷入这骇人的处境了。

A．people would support to create more environment areas
B．people would continue to support those national parks in existence
C．existing national parks would need to be more independent to survive
D．certain national environment areas should be left undisturbed by man