‌本案例采用的调查方法是‌
‌The investigation method used in this case was‌

A．仅关注了人文地理因素对别墅区选址的影响
only concerned about the impact of human geographical factors on the villa location
B．实地调查，对别墅编号，补充在原来地图中
investigation the villas in field, coding them and adding in the original map
C．仅关注了自然地理因素对别墅区选址的影响
 only concerned about the impact of physical geographical factors on the villa location
D．仅调查沿路边出现的、特色明显的别墅
only investigated the villas that appear along the road and have distinctive characteristics