A _________ activity is one that has more than one activity taking place at the same time. burst merge parallel slack dangling

# Brief Explanations:<br />In project management and various scheduling contexts, an activity where more than one task is happening simultaneously is referred to as a "parallel" activity. This terminology suggests that these tasks or activities run alongside each other in time. The concept of parallel activities is key in understanding and optimizing workflows and processes. The other terms do not correctly describe an activity with multiple simultaneous actions.<br /><br /># Answer:<br />C. parallel