Step 1: Analyse options.
- From "delanocrenia" (poisonous snake), we know delano = snake.
- The word for "deadly snake" must contain the root delano.
- Options (b) and (c) contain delano.
- Since "poisonous" was crenia, "deadly" must be a new suffix. vitri is a new suffix appearing in other "new" definitions in this set.
Step 2: Conclusion.
The most logical construction for "deadly snake" is delanovitri.
Final Answer: (c) delanovitri