Final answer:
A Yeoman is the correct answer for a forester or outdoorsman also in attendance in a royal household. Squires served knights, and Knights were noble mounted warriors.
Step-by-step explanation:
The individual in a royal household who could be a forester or outdoorsman, and also attended the royal household is best identified as a Yeoman (option A). Yeomen were often responsible for the maintenance of the forests and the protection of game, which was an important role during the feudal times.
Squires were typically young men who were training to become knights and would serve a knight as an attendant, while Knights were mounted warriors who often held a noble status themselves and could indeed belong to the royal household. Each of these roles contributed to the structure of feudal society, characterized by the importance of land ownership, military service, and social hierarchy.
In the context of historical societies mentioned, knightly classes were integral, but with the advent of firearms, the role of the mounted noble warriors diminished, leading to a societal transformation.