Concept:The correct option is chosen by matching the vowel sound in each word with the underlined vowel sound given in the question.
Explanation:The required vowel sound is the long /iː/ sound.
This is the sound heard in words such as "see" and "machine".
"Machine" is pronounced /məˈʃiːn/, so it contains the long /iː/ vowel sound.
"System" is pronounced /ˈsɪstəm/, which has the short /ɪ/ sound, not /iː/.
"Justice" is pronounced /ˈdʒʌstɪs/, and it also has a short /ɪ/ vowel sound.
"Begin" is pronounced /bɪˈɡɪn/, so it uses short /ɪ/ sounds as well.
Therefore, only "machine" has the required long /iː/ sound.
Answer:A. machine