McDonnelly, a Fast Food Chain, Is Testing a New Kind

McDonnelly, a fast food chain, is testing a new kind of sandwich in thirty cities.Three levels of advertising A₁, A₂, A₃) and two price levels P₁, P₂) are being considered.Which of the following is true? 1-McDonnelly is interested in estimating the effects of both advertising and price. 2-The appropriate design is the randomized control group design. 3-The appropriate design is the factorial design. 4-The experiment can be represented by R X₁A₁, P₁) O₁ n = 10 ------------------------- R X₂A₂, P₂) O₂ n = 10 ------------------------- R X₃A₃, P₃) O₃ n = 10

A) 1
B) 2
C) 3
D) 4
E) 1 and 3