I would say Carl should create a type of business report called a business proposal.
Sending a resume would make sense too though.
Doing nothing makes no sense, so that option is obviously out!
Leaving a long voicemail would be a very poor choice, so definitely not that either!
Counterbalanced designs allow the researcher to isolate the main effects due to condition and control for order and sequence effects only if there is no interaction between the procedural variables and the independent variables.
