Final answer:
A common refresh rate for an LCD is 60 Hz, providing a balance between performance and power consumption, with higher and lower rates available depending on the display's design and intended use.
Step-by-step explanation:
The common refresh rate for an LCD (Liquid Crystal Display) is typically option B, 60 Hz. This means the display refreshes 60 times per second, providing a balance between performance and power consumption for most users and uses. Higher refresh rates like 200 Hz are available but are generally found in high-performance gaming monitors or professional displays. On the other end, older or less advanced screens might refresh at 30 Hz, resulting in potential screen flicker and less smooth motion. The refresh rate of 60 MHz is vastly higher than what is used for displays and is not a correct answer in the context of LCD refresh rates.