Final answer:
The correct sentence structure in the given personal narrative about Miss Leonard is whenever she can, Miss Leonard helps others and is very generous.
Step-by-step explanation:
The correct sentence structure in the given personal narrative about Miss Leonard is option c) Whenever she can, Miss Leonard helps others and is very generous.
This sentence follows a simple and clear subject-verb-object structure. The subject is Miss Leonard, the verb is helps, and the object is others. The adverbial clause 'Whenever she can' is properly placed at the beginning of the sentence to provide additional information.