42 × (4 + 2) = (42 × 4) + (42 × 2)
is an example of:

Correct option is B

Given:
42 × (4 + 2) = (42 × 4) + (42 × 2)
Solution:
a ( b + c ) = a × b + a × c is called a distributive property.
Hence, 42(4+2) = (42 × 4) + (42 × 2) is an example of  distributive property