題目下列何種抽樣方法所抽取的樣本,較具集中性與同質性?A.簡單隨機抽樣(simple random sampling)B.系統隨機抽樣(systematic random sampling)C.分層隨機抽樣(stratified random sampling)D.集束隨機抽樣(cluster random sampling)官方答案D