Solution:
Step 1:
Calculate the total value of stock X

Step 2:
Calculate the total value for Stock Y

Step 3:
Calculate the total value for stock Z

Step 4:
Calculate the total value of the shares but without the increase yet

Step 5:
Calculate the increase in the simple index

Step 6:
Add the increase in the simple index to the total value of the shares

Hence,
The final answer is

OPTION C is the right answer