Not only do major diseases afflict the elderly in particular of which there are more they are generally very expensive diseases to meet . Which of the following options, if true, most strengthens this statements?

• Studies revel that 60% of elderly people suffer from attack
• A dentist's major income comes from fixing artificial teeth for elderly patients
• Insurance companies do not cover Parkinson's disease because of the expenses involved
• Private nursinghomes have reported that cancer accounts for 50% of prolonged hospitalisation of the elderly