1). public support to implement these at any cost.2). success rate of these reforms from time to time.3). past experiences clearly indicating the success rate of such reforms.4). willingness of the political establishment to enforce implementation.

1). public support to implement these at any cost.2). success rate of

1.	1). public support to implement these at any cost.2). success rate of these reforms from time to time.3). past experiences clearly indicating the success rate of such reforms.4). willingness of the political establishment to enforce implementation.
Answer» The SENTENCE talks about defence reforms and we need to choose the correct option here as to what when backs the reforms leads to success. Only option 4 makes a clear meaning here that when such reforms are backed by political establishment and IMPLEMENTED, they are SUCCESSFUL reforms. The other options FAIL to convey any meaning.