The answer would be “but” since it contrasts his motivation with competing with others for a high score.
Hopefully this helped.
you have too sight the last name of the author and the page number whether it is a quote or paraphrased. the only time you don't have to is if you include it in the sentence.
Example for when you don't have to cite in text:
On page 13 Martin says, "blah blah bah bluh bleh blah"
... otherwise just put the citation in parentheses after the quote/paraphrase like so: (Martin,13)
North central plain ( I think ) southern plain
