A 40 year old farmer has itchy erythematous popular lesions on face,neck,V area of chest,dorsum of hands and forearms for 3 years.The lesions are more severe in summers and improve by 75% in winters.The most appropriate test to diagnose the condition would be:

• A. Estimation of IgE levels in blood
• B. Skin biopsy
• C. Intradermal prick test
• D. Patch test