How many letters are there in the Welsh alphabet including the letter "j"?

The Welsh alphabet consists of 29 letters. This includes the standard 26 letters of the English alphabet but also incorporates additional characters specifically used in Welsh, such as "ch," "dd," "ff," "ng," "ph," "rh," and "th," which are considered distinct letters in the Welsh writing system. The letter "j" is not native to Welsh but is included in the alphabet, often used in loanwords. Therefore, when counting the letters, including "j," the total reaches 29.

This makes the choice of 29 the correct answer, capturing both the unique letters of the Welsh language and the inclusion of "j." The options that provided 26, 28, or 30 are either counting based on different criteria or misunderstanding the structure of the Welsh alphabet.