The sentence showed the part of the story where Marilyn is making letters for her family. She wants her brother to remember only the positive side of her. This is a paraphrase of the sentence. "She paused from time to time to think carefully on what words to say for her family, then she continued to write her letters."
Answer: A. Leo is a dog.
Explanation: The most clearly implicit detail, is that Leo is a dog.
A because its asking something about probably the article instead of some that doesn't mean anything