Read the following extract and answer the question that follows. Construction data fudging kills reliability of official statistics

Revelations about irregularities in the way the infrastructure ministry collected and compiled key construction data have delivered a devastating blow to the credibility of government statistics as a whole. The facts have left no doubt that the ministry must take strong action to prevent a recurrence. But they have also underscored the need for a fundamental review of the entire government's systems for compiling and reporting official statistics...

The problem illustrated in the above extract is that of...

a) Data revision

b) Economic welfare

c) Unrecorded activity

d) Non-market production

1.8 Which of the following methods of calculating GDP would NOT be accurate when the information on the sale and purchases of intermediate goods and services is not available? (

a) The income method

b) The expenditure method

c) The production method

d) The cost method

Give explanation