Which of the following words contains a digraph?

A digraph consists of two letters that represent a single sound. In the word "cushion," the "sh" combination is a digraph, producing the /ʃ/ sound, which is distinct from the sounds of the individual letters 's' and 'h'. This characteristic makes "cushion" the correct answer as it showcases the use of a digraph effectively.

The other options do not contain digraphs; for instance, "hardly" contains distinct individual sounds for each letter, "taxi" does not have any letter pairs that form a single sound, and "represent" similarly does not showcase a digraph but rather individual sounds contributed by the letters.