Read the passage.

Some large-scale grocery stores want to get rid of the supermarket checkout lines. Many retail giants have opened cashierless supermarkets. Shoppers can grab milk or eggs and walk out without waiting in line or opening their wallets. It is the latest sign that supermarkets are serious about shaking up the $800 billion grocery market.

Which sentence could be added to the passage to maintain its formal style?

Cashierless supermarkets will eliminate many jobs.
I think customers will like supermarkets without cashiers.
It is more enjoyable to have cashiers at the registers.
Giving customers the option to shop quickly and efficiently is beneficial.