Options E and B: 'Muster' means 'gather as much of it (resources) as you can in order to do something'.Here, the government will 'gather as much of the resources as you can' to fight poverty.
Hence, it completes the sentence in meaning and option E is correct.
'Collect' means 'bring or gather together'. It simply means 'to gather', but does not have the same effect on the sentence as 'muster' does. The prior has a stronger meaning in comparison.
Hence option B is wrong.
Option A: 'Move' means 'make progress'.
Option C: 'Harness' means 'control and make use of, especially for producing energy'.
Option D: 'Exploit' means 'make use of (a situation) that is considered unfair'.
These words do not form a complete meaningful sentence. Hence options A, C sand D are wrong.