Final answer:
Omovo's irritation with his father is likely due to his anticipation of seeing a mysterious woman with a black veil being disrupted by his father's actions.
Step-by-step explanation:
According to the passage, the most likely reason Omovo is irritated with his father is that at that hour, for the past seven days, a strange woman with a black veil over her head had been going past the house, which Omovo seemed to be waiting for and observing. However, his father's preparation to go out, which included combing his hair, applying aftershave, and putting on a coat he had outgrown, may have been delaying or distracting Omovo from watching for this woman. The passage does not indicate involvement with the soldiers, dissatisfaction with his father leaving the house, secret work with the woman in the black veil, or annoyance due to the radio's performance. Therefore, the details suggest that Omovo's irritation is likely due to his anticipation of the mysterious woman's appearance being disrupted by his father's preoccupations.