D. Dr. Leo Beck, author of Reach the Stars, believes athletes put too much pressure on themselves to succeed (112).
Explanation:
Modern Language Association (MLA), states that when you make a citation of a certain author you either say his lastname int the citation or inside the parenthesis with the page number where you can find that claim in their own work, if you need more information about the source material you can go to the Works Cited page where he can find the complete information on that citation.