CONCEPT: The HCF is the greatest positive integer which divides each of the two numbers and LCM is the the smallest positive integer that is divisible by both the numbers. EXPLANATION: The HCF and LCM of the given numbers can be found out after expressing the numbers as a product of their prime factors. After prime factorisation, HCF can be found by multiplying the common factors and LCM can be found out by multiplying the common factors and all the other factors. The ratio of the HCF and LCM can be found out by dividing the HCF by LCM. CALCULATION: ⇒ 14 = 2 × 7 ⇒ 18 = 2 × 3 × 3 ⇒ HCF = 2 ⇒ LCM = 2 × 7 × 3 × 3 = 126 ⇒ (HCF/LCM) = 2/126 = 1/63 Hence D is the correct answer