The expected change in temperature which is expected to succeed the change which occurred on the graph is the increase in temperature. Hence, the most appropriate option is A.
The green house effect is usually triggered by the increased level of gas emission into the atmosphere.
The temperature level rises due to the green house effect which is due to the increased level of emission of gasses such as carbon.
Therefore, after the increase in the greenhouse gases emitted, the temperature will rise or increase.
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