Answer:
I would choose A but i don’t know the context before or after this sentence
Explanation:
Brooded means: Thinking deeply about something that makes someone unhappy
The perfect form is the verb tense used to indicate a completed, or "perfected," action or condition. Verbs can appear in any one of three perfect tenses: presentperfect, past perfect, and future perfect. Verbs in the perfect form use a form of "have" or "had" + the past participle
John Boyne is from Ireland if you're talking about where he was born
A mixture that cannot be easily distinguished between the different parts. Distillation is one of the only ways to remove the parts from each other. For example, in a fruit salad you can easily pick things out, but in jello you cannot take the sugar out.
maybe the author just want to keep that info secret and the story maybe not true at all so author doesn't want to tell readers, that what I think!
