In which conditions would IMC be encountered?

IMC, or Instrument Meteorological Conditions, occurs in situations where visibility is restricted and pilots are unable to navigate visually. This typically includes conditions such as cloudy skies, fog, rain, or any situation that obscures clear visibility of the ground and surrounding landmarks essential for visual flight rules (VFR) operations.

In this case, the choice that aligns with IMC is the presence of cloudy skies with limited visibility. Under these conditions, pilots are required to rely on their instruments for navigation and control of the aircraft, which is the essence of flying in IMC.

The other choices do not align with the definition of IMC, as clear skies with good visibility and optimal weather conditions for visual flight suggest an environment conducive to VFR operations. Additionally, daylight hours do not directly contribute to the classification of IMC, since it is more about weather conditions rather than the time of day.