Which of the following letters is symmetric about the line drawn for each?
In the given options, some letters are divided using a vertical line and some, using a horizontal line.
If we closely observe, after dividing the alphabet 'A', 'B' and 'C', the halves do not have the same features like design, length, etc. Both halves are not mirror halves and they can’t exactly overlap each other.
Hence, all these are not symmetrical.
But when we observe the alphabet 'D', both the halves of the letter can overlap each other when folded along the given line. Both halves are mirror halves.
So, letter 'D' is symmetric about the line.
Hence, fourth option is the correct option.