13. Which activity was common in Black churches during this period? A. Stock market trading B. Civil rights advocacy and community-building events C. Large-scale industria training D. Agricultura demonstrations

## Step 1<br />The question is asking about the common activities that took place in Black churches during a specific period. The options provided are: A. Stock market trading, B. Civil rights advocacy and community-building events, C. Large-scale industrial training, and D. Agricultural demonstrations.<br /><br />## Step 2<br />To answer this question, we need to consider the historical context of Black churches. Historically, Black churches have been known for their role in civil rights advocacy and community-building events. They have served as hubs for social and political activism, particularly during the Civil Rights Movement.<br /><br />## Step 3<br />The other options, such as stock market trading, large-scale industrial training, and agricultural demonstrations, are not typically associated with the activities of Black churches during this period.