Which of the following sentences uses commas correctly?
a. Consequently the house, which is known for its wonderful architecture, is infested with mice, cockroaches and alligators.
b. Consequently, the house which is known for its wonderful architecture is infested with mice, cockroaches and alligators.
c. Consequently, the house, which is known for its wonderful architecture, is infested with mice, cockroaches and alligators.
d. Consequently the house which is known for its wonderful architecture, is infested with mice, cockroaches and alligators.