Participants in a Psychological Study Completed the Raven's Progressive Matrices

Participants in a psychological study completed the Raven's Progressive Matrices test, a reaction time task, and a task designed to assess working memory capacity. The correlation between Raven's Progressive Matrices scores and average reaction time was -.70. The correlation between Raven's Progressive Matrices scores and working memory capacity was .76. These results suggest that __________.

A) neither mental speed nor working memory capacity is related to intelligence
B) both mental speed and working memory capacity are related to intelligence
C) mental speed is related to intelligence, but working memory capacity is not
D) working memory capacity is related to intelligence, but mental speed is not