we know that 
distributive property of multiplication over addition:

now, we will verify each options 
option-A:
3 × (4 + 5) = (3 × 4) + (3 × 5)
We can see that both sides match with property 
so, this is TRUE
option-B:
3 × (4 + 5) = (3 + 4) × (3 + 5)
We can see that right side does not match with property 
so, this is FALSE
option-C:
3 × (4 + 5) = (3 × 4) + 5
We can see that right side does not match with property 
so, this is FALSE