Concept:This problem checks the truth values of compound statements formed using implication, conjunction, and negation.Explanation:Statement I: Let p be "1 is not a prime number" and q be "2 is not a prime number".Here, p is true, but q is false because 2 is the smallest prime number.An implication p→q is false only when p is true and q is false.So statement I is not true.Statement II: e is a vowel is true, and 12×3=36 is also true.Since both parts are true, the conjunction is true.Statement III: Inside the statement, "14 is a composite number and 3 is an even number" is false, because 14 is composite but 3 is not even.The negation of a false statement is true, so statement III is true.Statement IV: 5 is an irrational number is true.Also, 3+5 is a real number, and every real number is a complex number with imaginary part 0.We can write 3+5=(3+5)+0i, so 3+5 is a complex number.Thus statement IV is true.Therefore, only statement I is not true.Answer:Option B: Only I.