Answer:
The value added from these transactions is $1200,option C
Explanation:
Initially the rancher took $0 worth of input and produced animal skin of $400,at that stage $400 was the value added.
Thereafter,the tanner brought $400 input and made output of $700,hence $300 has been added.
Finally,the shoemaker bought input for $700 and turned out shoes worth $1200,thereby adding $500.
From the foregoing,the total value added from the beginning to the end is $1200($400+$300+$500)