Question: Wannene a cikin waɗannan zai fi zama mafi kyawun sakamakon gurɓatacciyar iskar gas dake gurɓata yanayin duniya?
Options:
karuwar yanayin zaafin iska
raguwar ƙarfin iska
ƙaruwar ƙarfin hasken da ake gani
raguwar kaurin gilashin ozon leya 
Answer: A