Answer: c

The lightning diagram of item A analysis, also known as the split transaction diagram, is to mark the price changes of each transaction of futures contracts in time sequence and form it with connecting lines; Item B, K-line diagram is also called candle diagram, candle diagram, yin-yang diagram, etc. , in which each K line represents the opening price (the first transaction price), closing price (the last transaction price), the highest price and the lowest price in a certain trading period; Item d, bamboo chart is also called bar chart and bar chart, with the horizontal axis representing time and the vertical axis representing price. The bamboo chart and the K-line chart have different ways of expression, but the content composition is exactly the same.