Challenge which is not faced by the host countries while taking care of refugees is "Climate"
Refugees are people who have fled war, violence, conflict or persecution and have crossed an international border to find safety in another country. They often have had to flee with little more than the clothes on their back, leaving behind homes, possessions, jobs and loved ones. The term refugee derives from the root word refuge, from Old French refuge, meaning "hiding place". It refers to "shelter or protection from danger or distress".
Refugees face many problems in host country such as language, healthcare, education, etc.
Hence, option C is correct.
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