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根据下列文章,请回答题。Effects of Exercise on Elderly Diabetics(糖尿病人)Most older people with S0—called type 2 diabetes(糖尿病)couldstop taking insulin(胰岛素)if they would do brisk(轻快的)exercise for 30minutes just three times a week，according to new medical research resultsreported in a Copenhagen newspaper．Results from tests conducted on diabeticsat the Copenhagen central hospital Rigshospitalet'S Center for Muscle Researchshowed that physical exercise can boost the body's ability to make use ofinsulin by 30 per cent．This is equal to the effect most elderly diabetics getfrom their insulin medication(药物治疗)today．Researchers had a group of non-diabetic men and agroup of men with type 2 diabetes，all more than 60 years of age，exercise onbicycles six times a week for three months．After the three months the doctorsmeasured how much sugar the test subjects,muscles could make use of as ameasure for how well their insulin worked．
Associate Professor Dr Flemming Dela of the Muscle Research Center saidthe tests demonstrated that the exercising diabetics had made as good use of insulinas the healthy non．diabetic persons．“This means that the insulin works just aswell for both groups．Physical exercise cannot cure people of diabetes，but itcan eliminate almost all their symptoms．At the same time It can put off thepoint at which they have to begin taking insulin．”Dela said．
Insulin is a hormone produced by the pancreas(胰腺)，controlling sugar inthe body and is used against diabetes．
Dela said that to achieve the desired effect diabetics need onlyexercise to the point where they begin to sweat。but that the activity has to bemaintained since it wears off after five days without sufficient exercise．
Most diabetics realize that they have to watch their diet whileremaining unaware of the importance of exercise。Dela added．What is the effect of exercise on elderlypeople with type 2 diabetes? A．It can help the body make betteruse of insulin
B．It can worsen their symptom
C．It can help them to eat mor
D．It can cure them of thediseas
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