农产品的最终销售多为零售,需求弹性较低,决定了农产品广告的( ) 特点。 The final sales of agricultural products are mostly retail, and the demand elasticity is low, which determines the ( ) characteristics of agricultural product advertising. A. 季节性 seasonal B. 广告效果测定困难 difficulty of advertising effect measurement C. 广告费用不宜过高 low cost of advertising D. 调节控制性 regulatory control