Answer:
B. After I get up in the morning,
Explanation:
After is a subordinating conjunction that introduces a time clause. Time clauses are dependent clauses used to indicate when something happened.
The clause "After I get up in the morning" tells when the action in the main clause (drinking a cup of coffee) happens:
"After I get up in the morning, I drink a cup of coffee." It is the most logical choice of all.