I have taken the test and I can confirm that the answer is
B. 15 m, 20 m, and 25 m.
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Answer:

Step-by-step explanation:
step 1
Find out the price of 160 begonias, if she bought them separately

step 2
Find out the price of 160 begonias, if she bought them by the flat
Remember that
One flat are 20 plants
so
For 160 plants are needed
160/20=8 flat

step 3
Find out the difference

1 is scalene, 2 is equilateral, and 3 is isosceles.
Answer:
12
Step-by-step explanation: