Final answer:
The word with an open syllable from the options provided is 'Resign'. In 'resign', the first syllable 're-' is open because it ends in a vowel that is not followed by a consonant.
Step-by-step explanation:
The word with an open syllable is Resign (D). An open syllable ends with a vowel, and the vowel often has a long sound because it is not followed by a consonant within the same syllable. In the word 'resign', the syllable 're-' ends with the vowel 'e' and is not immediately followed by a consonant, making it an open syllable.
When underlining the letters that represent the /b/ sound in the provided list of words, the letters 'b' in each word would be underlined as follows:
- able
- scribble
- resemble
- pebble
- tremble
- noble
- gamble
- bubble