Hi !!
Carl had eaten the last piece of cake
had eaten = past perfect (have -past- + past participle)
to eat is an irregular verb = eat //ate//eaten
simple past = ate
past progressive = was eating
present progressive = is eating
hope I helped !!
I think the right answer is C. Have a nice day! Hope this helped.
Answer:
VARIOUS TERMINAL ARE CONNECTED TO THIS WORKSTATION.