Questão de Língua Inglesa

Consider the following statements about the underlined words in line 14 “drier and hotter” and the context presented in the text: I. They are the comparative forms of the adjectives “dry” and “hot”. II. They follow the same spelling rules as “funny” and “wet” respectively. III. It would be grammatically incorrect to use “more dry” or “more hot” instead of “drier” and “hotter” because “dry” and “hot” are short adjectives. Which statements are correct?