Determine the wind and temperature aloft forecast for MKC at 6,000 feet.

The correct choice indicates a wind direction of 200 degrees true at a speed of 6 knots and a temperature of +3 degrees Celsius.

In the context of wind and temperature aloft forecasts, the wind direction is typically given in degrees true, which makes the choice that specifies 200 degrees true appropriate. This means that the wind is coming from the southwest and is gentle, as indicated by the speed of 6 knots.

Additionally, the specified temperature of +3 degrees Celsius is a crucial piece of information for pilots, as it helps in assessing potential icing problems and aircraft performance at that altitude.

The clarity and completeness of the information in this option, with both the wind and the temperature provided, make it the most helpful and accurate choice for pilots planning their flight.