Concept:The underlined o in whole /həʊl/ is the diphthong /əʊ/, as in go and home.Solution:Find the vowel sound in each option:A. Gill: /ɪ/ (as in sit)B. Goal: /əʊ/ ✓ (whole and goal rhyme)C. Gaul: /ɔː/ (as in ball)D. Gaol: /eɪ/ (gaol is pronounced like jail, /dʒeɪl/)Only "Goal" has the /əʊ/ sound of "whole".Key point: "Gaol" looks like "goal" but is a British spelling of jail.Answer:Option B (Goal)