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The conjunction that bestfits the run-on sentence is
d. and
In the text of 'why summer makes us lazy', the author tells us the impact of weather on human's mood and she made this idea by studying the changes that takes place in the climate during summer.
<h3>Why does
summer make us lazy?</h3>
Maria Konnikova tells us in her book that that a lot of people are said to be very effective in the cold weather than when it is warm weather.
Therefore, In the text of 'why summer makes us lazy', the author tells us the impact of weather on human's mood and she made this idea by studying the changes that takes place in the climate during summer.
Learn more about summer from
brainly.com/question/4172420
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