Unsupported, because we only know that there are some faster configurations. There could be many others that are equally slow. And, most people might not be able to type faster even if the configuration makes it possible. They might need training and experience to type faster.

Unsupported. We don’t have a comparison between early and later typewriters. If anything, we might suspect early typewriters were more likely to jam than later ones, assuming that technology improved in the later ones, allowing for faster typing.

Unsupported, because the designers of early typewriters would still be working within the limitations of the then-current technology. They still had to deal with the fact early typewriters could jam if typed too quickly.

Unsupported, because the stimulus doesn’t give us enough to evaluate the costs and benefits of a new configuration. We know that switching would be costly and inconvenient, and we don’t know whether the benefit of faster typing would outweigh those costs.

Strongly supported, because we know the QWERTY keyboard was designed to limit typing speed because they were designed for early typewriters. If keyboards were designed for something that did not jam when typed quickly, they probably wouldn’t have needed to limit typing speed.