The answer to your question is love.
A reliable source is a document!
William Makepeace Thackeray wrote the novel Vanity Fair in 1846 and it was published as a 19-volume monthly serial from 1847 to 1848,
The novel takes place in the early 1800s, in the first years of the Victorian era, when the country was submerging into a strong and oppressive conservative way of life.
The plot tells the saga of two families during the Napoleonic wars.
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Answer:
D. "Thomas spotted a chocolate donut in the glass case" sounds correct to me.