This table shows the performance of the selection of 100 stocks after one year. (Take S to be a set of all stocks represented in the table.) Use symbols to describe the event that Internet stock did not increase. How many elements are there in this event?
?
Companies Total PharmaceuticalP ElectronicE InternetI Increased V15101540 Unchanged N1551030 Decreased D1051530 Total40 2040100?
A. The event is 
, the number of elements is 25.
B. The event is 
, the number of elements is 10.
C. The event is 
, the number of elements is 10.
D. The event is 
, the number of elements is 25.
E. The event is 
, the number of elements is 15.
Answer: A
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