Concept:The letters "oa" in "soar" have the vowel sound /ɔː/.
Explanation:The word "soar" is pronounced as /sɔː/.
The vowel sound that we must match is /ɔː/.
Now compare the vowel sound in each option:
"pot" is pronounced /pɒt/.
"foal" is pronounced /fəʊl/.
"catch" is pronounced /kætʃ/.
"caught" is pronounced /kɔːt/.
Only "caught" contains the same vowel sound /ɔː/ as "soar".
Answer:D. caught