Answer:
37
Step-by-step explanation:
As seen, the graph is pointing/increasing upwards. This means that the graph is exponentially increasing.
You notice there are significantly more spores at 4th hour than the first, therefore, this is an increasing trend.
Hope I helped :)
Well after reading this 100 times I haven't found a 100% sure answer but I think its A
hope its right and it helps :D