The correct options are
B 345
C 444
If a number is divisible by 3 . The sum of each individual number must be divisible by 3 .
Example ;
343 = 3+4+3 =10
10 is not divisible by 3. Hence, 343 is not divisible by 3.
345 = 3+4+5 =12
12 is divisible by 3. Hence, 345 is divisible by 3.
444 = 4+4+4 =12
12 is divisible by 3. Hence, 444 is divisible by 3.
344= 3+4+4 =11
11 is not divisible by 3. Hence, 344 is not divisible by 3.