Palindromes are words, numbers or sentences which read the same in forward or reverse order.
If we reverse 43234, we get 43234. It is same when reversed.
If we reverse 12321, we get 12321. It is same when reversed.
If we reverse LEVEL, we get LEVEL. It is same when reversed.
If we reverse 43414, we get 41434.
Option D, 43414 is not same in forward or reverse order.
Hence, 43414 is not a palindrome.