Which of the following options is the best substitute for the underlined words in statement I?

Directions: In this passage, errors or parts of a sentence, which have been left out, have been underlined. To correct these errors and correctly complete the passage, choose the correct option.
Statement I: It was a bright Sunday morning. Mrs. Milky, the cow was invited Mr. Humpy
Statement II: the camel, for lunch. When the doorbell blow, she opened the door, and
Statement III: there was Mr. Humpy all dressed up in they Sunday clothes. They greeted
Statement IV: each other _________ .