Coding — How is 'go' written in the code language? Statements: I. 'go over there' → 'pa da na'. II. 'go and sit' → 'sa ka pa'.

Introduction / Context:
We must isolate the unique code for 'go' using two coded sentences that both contain the word.

Given Data / Assumptions:

• S1 tokens {pa, da, na} ↔ {go, over, there}.
• S2 tokens {sa, ka, pa} ↔ {go, and, sit}.

Concept / Approach:
Intersection logic: common English word across sentences ('go') maps to the common token across their code sets.

Step-by-Step Solution:

Verification / Alternative check:
Assign the remaining tokens bijectively to the other words; no conflicts occur.

Why Other Options Are Wrong:

• A/B/C: Each single sentence admits multiple token-word assignments.
• E: While the combination is sufficient, it is also necessary since neither alone suffices; we mark this as 'together necessary' (choice D).

Common Pitfalls:
Assuming positional order implies mapping; DS treats them as sets.

Final Answer:
D — Both statements together are necessary ('go' = 'pa').