Step 1: Recall the two limits:
For an OPC under Rule 3 there were two size limits. One was on paid up capital, at Rs. 50 lakh. The other was on average annual turnover of the three previous years, at Rs. 2 crore.
Step 2: Pick the turnover figure:
The question asks only for the turnover limit. That is Rs. 2 crore. The Rs. 50 lakh figure is for capital, so it is not among the options.
Step 3: Reject the other figures:
The values Rs. 3 crore, Rs. 4 crore and Rs. 5 crore do not appear in this rule. They are only distractors.
Final Answer:
Option (1).
\[ \boxed{\text{Rs. 2 Crores}} \]