SAT Question 41d5c33e: Central Ideas And Details answer and explanation

English - Central Ideas And Details - Inference
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The following text is from Beatrice Harraden’s 1894 novel Ships that Pass in the Night. In an old second-hand bookshop in London, an old man sat reading Gibbon’s History of Rome. He did not put down his book when the postman brought him a letter. He just glanced indifferently at the letter, and impatiently at the postman. Zerviah Holme did not like to be interrupted when he was reading Gibbon; and as he was always reading Gibbon, an interruption was always regarded by him as an insult.
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Difficulty:Easy
Based on the text, how did Zerviah Holme most likely feel when the letter was delivered?