Refer to the Table

Multiple Choice

Refer to the table.
The table represents the result of a survey of 39 lakes, some with and some without introduced rainbow or brook trout. The values are averages of the number of frogs present along a 10-meter piece of shoreline in lakes with and without trout. Given these results, one can conclude that

A) introducing trout into a lake seriously depletes the number of frogs present.
B) introducing trout into a lake has little or no effect on the number of frogs present.
C) introduced rainbow trout decrease frog populations but introduced brook trout do not.
D) introduced brook trout decrease frog populations but introduced rainbow trout do not.