Which of Koshi and Roberta's assumptions, when tested, resulted in the response, "This is where we were totally wrong"?

We believe that people care about sleep quality when making a pillow purchase decision.

We believe that we can sell online directly to customers.

We believe that our customers will be young urban professionals.

We believe that our very first customers will be new graduates who need to outfit their apartments.

We believe that we can sell our pillows at a high enough price to cover our costs.

We believe that we can raise enough capital to cover investments in manufacturing.