Explanation:

Alright, let’s break this down step by step:

- First, let’s sum the digits for each number:

- 243: 2 + 4 + 3 = 9

- 874: 8 + 7 + 4 = 19

- 923: 9 + 2 + 3 = 14

- 456: 4 + 5 + 6 = 15

- 721: 7 + 2 + 1 = 10

- Now, we need to check how many of these sums are divisible by 2 (in other words, how many are even numbers):

- 9 ? odd, not divisible by 2

- 19 ? odd, not divisible by 2

- 14 ? even, divisible by 2

- 15 ? odd, not divisible by 2

- 10 ? even, divisible by 2

- There are two numbers (14 and 10) that fit the bill—so two numbers formed are divisible by 2.

So, the correct option is:

Option:1, Two

And for the record:

- Option:2 (One) is wrong, only one doesn’t fit.

- Option:3 (Four) overshoots—definitely not four.

- Option:4 (Three) isn’t it, not enough even sums.

- Option:5 (None of these) misses the mark—not zero, not another number.

Hope that clears it up!