Which is an example of a problem and solution structure
a:The basketball hoops at the school playground are rusting. Besides, the basketball nets are tearing.
b:The cafeteria has been serving stale food for months. The school administration must put a concrete deadline on when cafeteria food is no longer considered fresh
c:Most objects that are painted black absorb more heat than they reflect. Objects with irregular surfaces are also efficient absorbers.
d:Most fast food restaurants sell food products that develop harmful cholesterol and triglycerides in the body. Moreover, the ingredients of these products may become stale by the time they are used.

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