Lana’s traits of being focused on achievement, self-disciplined, and keen to do his duty align with the personality trait of Conscientiousness. Conscientiousness is one of the Big Five personality traits, which refers to being diligent, careful, and goal-oriented. People who score highly in conscientiousness are often organized, reliable, and efficient in completing tasks.
Step 1: Analyze the options.
(A) Conscientiousness: This is the correct trait that aligns with Lana’s description, indicating high levels of self-discipline and duty.
(B) Neuroticism: This trait involves emotional instability and anxiety, which does not match Lana’s focus on self-discipline and achievement.
(C) Agreeableness: This trait is more related to being cooperative and compassionate, but it is not directly linked to Lana’s focus on achievement and discipline.
(D) Extraversion: This trait relates to being outgoing and energetic, but it is not as closely aligned with Lana’s described behavior.
Step 2: Conclusion.
Based on Lana's described characteristics of being focused on achievement and self-discipline, the correct answer is (A) Conscientiousness.
Final Answer:
\[
\boxed{(A) \, \text{Conscientiousness}}
\]