In July 2020, your warehouse received 325 customer orders and 296 of them were picked correctly. Meanwhile, 356 customer orders were sent to your warehouse in August 2020 of which 318 were picked correctly. What would be your correct conclusion about your warehouse's picking error rate? Make sure you justify your answer with the proof of calculation.

a. My warehouse's picking error rate in August is better than that in July

b. My warehouse's picking error rate in August is worse than that in July

c. My warehouse's number of customer orders received in August is higher than that in July

d. My warehouse's number of customer orders received in July is higher than that in August