Okay now first let's see the odd numbers between 1 and 10. The odd numbers are 1,3,5,7,9 . The even numbers are 2,4,6,8,10. The factors of 10 are 1,2,5 and 10. The factors of 6 are 1,2,3,6. Now let's just apply this info to your questions . (A) says that a whole number less than 10 if odd must be a factor of 10 which is clearly FALSE coz 3 is an odd number less than 10 but is it a factor ?! Nope !! Next , (B) says that a whole number less than 10 , if a factor of 10 must be odd. This is also FALSE because 2 is a factor of 10 but it is EVEN !! 2A says that a whole number less than 10 and if even is a factor of 6 -- FALSE because 4 is less than 10 and is even but isn't a factor !! Now a factor of 6 less than 10 is even --- FALSE coz 1 is also a factor of 6 but it's odd !!