A Marketing Research Firm Is Testing Consumer Reaction to Odorless

A marketing research firm is testing consumer reaction to odorless charcoal briquettes by asking people in the community to test the briquettes and then following up with a telephone survey to learn how they feel about the product.The firm has found that different samples from the same general population give remarkably different survey results.With certainty,it can be said that the firm's test lacks:

A) reliability.
B) distinctiveness.
C) clarity.
D) standardization.
E) focus.