The three sentences that provide evidence supporting the claim that the journalism industry is severely lacking in leadership by women and racial minorities are:
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Women run three out of the 25 biggest U.S. titles and one of the top 25 international titles.
(This emphasizes the underrepresentation of women in leadership roles.) -
Racial minorities fare even worse, comprising 13 percent of overall employees.
(This highlights the lack of racial diversity in the industry.) -
One factor in this disparity is the fact that more men than women hold "hard" news beats such as politics and world news, where organizations often turn to hire management.
(This indicates a systemic issue that affects the leadership landscape, contributing to the lack of women and racial minorities in leadership positions.)
These sentences collectively strengthen the assertion about the lack of leadership diversity in the journalism field.