In the following question, a sentence is given with a phrase highlighted in bold. Find out the phrase, among the phrases (a, b, c,
d) given below each sentence, which should replace the phrase printed in bold to make the sentence grammatically correct. If the sentence is already correct, mark (5),
i.e. 'No correction required', as the answer. For countries that have accepted large numbers of refugees, it can be extremely difficult to provide them within a reasonable quality of life.

The sentence highlights that countries which have accepted large numbers of refugees find it extremely difficult to provide them with a suitable quality of life. This negates options (b), (d) and the original sentence, because they use prepositions 'by', 'of' and 'within' which render the sentence meaningless. The noun 'quality' must be qualified by an adjective. Based on this, option (c) is negated, because 'reason' is a noun. Option (a) fits the sentence both contextually and grammatically; hence, (a) is the correct answer.