Which of the Following Could Be Considered to Be Substitutes

Multiple Choice

Which of the following could be considered to be substitutes for purchasing a mug of coffee from a Starbucks coffee shop?

A) Purchasing a cup of coffee from Costa coffee shop
B) Purchasing a cup of coffee from an independent (non-chain) coffee shop
C) Making a coffee at home with a Gaggia coffee machine
D) Making a cup of Nescafe instant coffee at home