In a Marketing Research Study for a Manufacturer of Compost

In a marketing research study for a manufacturer of compost bins, _____ would most likely be a source of primary data.

A) reports from organic gardening organizations
B) a study done by Duke University on how individuals feel about gardening
C) annual financial statements provided by the compost bin manufacturer
D) a survey conducted by Mother Earth News
E) researchers' interviews with hardware store owners who sell compost bins