D. John said that he would be 21 the following day.
Explanation
Indirect Speech is used to report something in our own words.
To change future tense in indirect speech, remove inverted commas and use 'that' as a conjunction.
Both shall and will normally become would. 'Tomorrow' is changed to 'the following day'
In the given sentence, 'shall' cannot be changed to should as the speech is not reported by the original speaker. It would change to 'would'. Thus, option C is the correct answer according to the rules.
A. food processing, cooking oil, ceramics, gems and jewelry
B. marble, minerals, agriculture machinery, iron and steel
C. All of these
D. motorbike assembling, electrical appliances and automobile
Explanation
The CPEC special economic zones include food processing, cooking oil, ceramics, gems and jewellery, marble, minerals, agriculture machinery, iron and steel, motorbike assembling, electrical appliances and automobile