The quick ratio is calculated as:
\[
\text{Quick Ratio} = \frac{\text{Current Assets} - \text{Inventory}}{\text{Current Liabilities}}.
\]
For a decrease in the quick ratio, the numerator (current assets minus inventory) needs to decrease.
- Sale of goods costing \rupee10,000 for \rupee12,000: This will increase cash and decrease inventory by \rupee10,000, but the quick ratio should increase.
- Cash collected from trade receivables \rupee41,000: This will increase cash, which increases the numerator and thus the ratio increases.
- Purchase of goods for cash \rupee38,000: This will reduce cash, decreasing the numerator, and hence, the quick ratio will decrease.
- Creditors were paid \rupee11,000: This will reduce liabilities, which will increase the ratio.
Thus, the correct answer is (C) Purchase of goods for cash \rupee38,000.