A leader should be able to secure desirable actions from his followers 'voluntarily' without the use of force or 'coercion' or cajolery. Both force or coercion and/or flattery or cajolery can be used to make an unwrilling person do the work. Hence logically A and F can fit into the blank.

Pollutants are responsible for 'causing' many diseases. Hence they are deleterious to our health. None of the others would make the sentence meaningful.

The word for the blank is linked with 'remote' with the conjunction 'and'. Hence 'isolated' and 'secluded' are the most appropriate options.

One should not think that peace comes only from violence. It is not a condition of 'passivity' or 'inactivity' or lethargy. The word 'alert' points to choice (A).

Poaching of wild animals is still being carried out. This is happening 'despite strict or stringent laws' or laws which cannot be broken, (binding) infrangible laws that are enforced on poachers. But still poaching of wild animals continues, as it is done secretly or 'clandestinely'.

The words 'hungry' and 'devour' do not go together, as the word 'hungry' is too mild to be used with 'devour'. 'Famished' and 'ravenous' are in tune with the word 'devour'. 'Voracious' is collocation-wise inapt. Hence choice (C)

'Stressful' or 'taxing' jobs lead to diseases like hypertension.

Villages can be 'inundated'(submerged) in a 'deluge'.

A mob can only be 'recalcitrant' (disobedient) or 'obdurate'. The word 'dogged' has a positive connotation and hence is not used with 'mob'.

It is clear that Jammu and Kashmir is directly taken the brunt of terrorism. Hence it is 'reeling' or 'shaking' under its impact.