Using proportions, it is found that the length each increase of 4 degrees Celsius is given by:
B.) 1/2 minute
What is a proportion?
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
Looking at the graph, the increase is of 16 degrees in 2 minutes, hence the rate is given by:
r = 16/2 = 8 degrees per minute.
For 8 degrees, the time is given by:
t = 4/8= 1/2 minute, hence option B is correct.
More can be learned about proportions at https://brainly.com/question/24372153
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