The HCF of two even numbers should be at least ___________.

Correct option is D

Given:
We are dealing with two even numbers.
Solution:
An even number is any number that is divisible by 2. Therefore, any two even numbers will both be divisible by 2.
Since both numbers are divisible by 2, 2 is a common factor of both. Even if the numbers have no other common factors, they will at least have 2 as a factor.
The Highest Common Factor (HCF) is the greatest number that divides both given numbers.
So, the smallest possible value for the HCF of any two even numbers is: 2