The least possible Venn diagram for the given statements is as follows-
Conclusions:I. No consonant is a vowel → Can't say as there is No clear relation is given between Vowel and consonants II. No digit is a vowel → False → According to Statement 1. III. Some consonants are vowels → False → (It is possible but not definite). Both conclusions I and III form a complementary pair, hence either I or III follows. Hence, Option (4) is correct.