Explanation:

Correct Answer is (c).The given statement implies that the Syrian Government and its allies must have got their troops around the province and that is causing the perception that they will attack the province soon.
Option A is not correct because realization of troops is not correct usage and it is illogical to use this phrase. The second word is also out of context since eminent implies somebody who is a prominent and renowned person.
Option B is not correct because according to the given context, the attack on the province cannot be called as excellent and it will be completely irrelevant to use this word in this given context.
Option D is not correct because the first word for the first blank is not perfect as resources will not be the right word for this blank. The second word may be used to imply that the attack was severe though the word extreme is not the appropriate word for the context and there are better words to denote the implication intended in this sentence.
Option E is not correct because assimilation of troops is completely illogical and hence this choice can be safely eliminated from our consideration.
Statement C is the correct choice because the government and its allies have got the troops around the province and this can be explained well by the given word mobilization whereas the second blank can also be filled with the word imminent which will mean an impending attack on the said province. So, both the words are correct for the given blanks.
This makes option C the correct choice among the given options.