Extending @RomanPerekhrest's answer (go upvote it now):

mapfile -t answers < <(jq -r '.results[] | [.correct_answer] + .incorrect_answers | @sh' <<<"$quiz")
declare -p answers

declare -a answers=([0]="'Amazon' 'Netflix' 'BBC' 'CCTV'" [1]="'60 lbs' '30 lbs' '50 lbs' '70 lbs'" [2]="'True' 'False'")

Then, you can use something like this

for i in "${!answers[@]}"; do
    declare -a "this_answers=( ${answers[i]} )"
    echo $i
    printf " > %s\n" "${this_answers[@]}"
done

0
 > Amazon
 > Netflix
 > BBC
 > CCTV
1
 > 60 lbs
 > 30 lbs
 > 50 lbs
 > 70 lbs
2
 > True
 > False