The imbalance between uplink and downlink coverage in C-band is not fixed, it varies depending on

the network configuration, location, and other factors. Generally speaking, it's hard to provide an

exact number for this imbalance, as it depends on the specific network conditions and the

equipment used.

However, a common practice is to use more power in downlink than uplink, this is due to the fact

that downlink is more sensitive to path loss than uplink, and also because the downlink signal is

intended to cover a larger area than the uplink. Therefore, the imbalance is commonly in the range

of 3 to 6 dB, and it's more likely to be at the lower end of that range. So, the correct answer is B. 3dB

It's worth noting that the C-band is not the most popular frequency band for 5G network

deployment, it's just one of the many frequency bands that are being used for 5G deployment, and

the most popular frequency bands for 5G deployment vary depending on the country, region, and

operator.