Use the line graph given here to solve the question: Among the options given, the combined percentage contribution of ‘Problem A’ and ‘Problem B’ towards ‘Biggest School problem’ is least for the year?
1970 = 12+18 = 30%
1975 = 10+15 = 25%
1985 = 10+19 = 29%
2005 = 10 +21= 31%
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