Which of the following PC peripheral connection types is the most probable choice for compatibility if a peripheral requires a data speed of 20 Gbps and requires a power supply of 9 W when connected to a PC?

Thunderbolt v1 and v2 both have a data rate of 20 Gbps. Thunderbolt 3 effectively doubles the data bandwidth to 40 Gbps. Thunderbolt 3 and Thunderbolt 4 can also offer the required power. USB 3.0 only provides roughly 5 W of power and operates at a much slower 5 Gbps. eSATA is also slower and does not supply power, although eSATAp does. Unless it's DisplayPort over USB, DisplayPort is generally slower and doesn't deliver any power.