In the Weeks Following CVA,why Might Some Neurologic Function Return

Multiple Choice

In the weeks following CVA,why might some neurologic function return?
1) presence of collateral circulation
2) immediate therapy to dissolve thrombi and maintain perfusion
3) reduced inflammation in the area
4) development of alternative neuronal pathways

A) 1 only
B) 2 only
C) 1,3
D) 2,3,4
E) 1,2,3,4