The correct answer is A) Labyrinth-Honeycomb. Labyrinth-Honeycomb seals are commonly used in the sump and turbine areas of gas turbine engines. These seals create a tortuous path for air to leak, using a series of interlocking grooves and lands to restrict airflow and maintain pressure differentials within the engine. The honeycomb structure provides additional sealing capability and helps to minimize leakage. This type of air seal is specifically designed to withstand the high temperatures and pressures found in these critical engine sections. The other options are not correct for this application. Lip-type seals are more commonly used in other types of rotating machinery, while fishmouth and pneumatic carbon ring seals are not typically found in gas turbine engine designs.