Select the most appropriate option to fill in blank number

Explanation

The sentence should be read as: “He became convinced that he was not a bird at all and refused to fly.” This makes an appropriate sense in the context, as pigeons are naturally expected to fly, and the passage describes Ari’s unique behaviour. The other options do not fit with the actual context of the sentence. “Read” means to look at and understand written text, “flea” refers to a small insect, and “file” refers to a collection of documents or an action of smoothing with a tool, none of which make sense in the given context.