Step 1: Understanding the Concept:
This question involves combining two sentences into one using the adverb 'too' and an infinitive 'to'. This structure is used to show that a certain quality prevents a certain action.
Step 2: Key Formula or Approach:
The structure is: Subject + verb + too + adjective/adverb + to-infinitive.
This structure `too...to` has a negative meaning. "Too dull to pass" means "so dull that she cannot pass".
Step 3: Detailed Explanation:
Let's apply the structure to the given sentences: "She is very dull." and "She cannot pass."
- Subject: She
- Verb: is
- Adjective: dull
- To-infinitive: to pass
Combining them gives: "She is too dull to pass."
- Option (A) matches this structure perfectly.
- Options (B), (C), and (D) have incorrect word order and are grammatically wrong.
Step 4: Final Answer:
The correct and standard way to combine these two sentences using the `too...to` construction is "She is too dull to pass". Therefore, option (A) is correct.