The feudal system in japan developed during the period.
mongol
kamakura
minamoto
kamikazi

It was the Kamakura period.  The Shogunate was established by Yoritomo Minamoto. During this period, Buddhism flourished and the Samurais proved themselves against the Mongols who invaded Japan twice but failed each time.  Later the Shogun became the actual ruler of Japan.

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.