Final answer:
1940s masculinity in the USA was characterized by a strong adherence to traditional gender norms, emphasizing physical strength and self-sufficiency.
Step-by-step explanation:
In the 1940s, masculinity in the USA was characterized by a strong adherence to traditional gender norms (C). This meant that men were expected to display qualities such as physical strength, toughness, and self-sufficiency. Other traits associated with 1940s masculinity included assertiveness, stoicism, and being the primary provider for the family. Emotional expression (A) was not emphasized, as men were often taught to suppress their emotions and maintain a sense of control.