Polly Petunia Is Chief Horticulturalist for the Southwest Region,encompassing Arizona,New

Polly Petunia is Chief Horticulturalist for the Southwest region,encompassing Arizona,New Mexico,and Texas.She wants to survey amateur gardeners in her region to determine what,if any,water conservation practices they employ in their home gardening.Polly sends her survey to 150 randomly selected gardeners in each state.Polly is using:

A) purposive sampling.
B) proportional stratified sampling.
C) systematic sampling.
D) stratified random sampling.