Option C is the correct answer because ‘segregated’ means ‘separated
from others’. It is mentioned that there were two areas in the coffee room: smoking area and non-smoking area. Thus, option C is the most appropriate word to complete the
meaning of the sentence.
Option A is incorrect because ‘amalgamated’ means ‘to combine’. The sentence
describes ‘into smoking and non-smoking areas’. Thus, option A is the not the
appropriate word for the given sentence.
Option B is incorrect because ‘considered’ means ‘take into account’. Thus,
option B is the not the appropriate word to complete the meaning of the given
sentence.
Option D is incorrect because ‘shared’ means ‘to divide’, which does not fit stylistically in the sentence.