Which of these sentence contains a subordinate clause?
a. the goal of both men was to win the election at all costs.
b. darkness descended on the countryside, and many stars became visible.
c. i may seem calm before a performance, but inside i am really quite nervous.
d. although spain ruled the colony for nearly 300 years, peru won independence in 1826.

Although alice walker published a number of essays, poetry collections, and stories during the 1970s, her third novel, the color purple, ) which was published in 1982, brought her the widest acclaim in that it won both the national book award as well as the pulitzer prize (b) published in 1982, bringing her the widest acclaim by winning both the national book award and the pulitzer prize (c) published in 1982, brought her the widest acclaim, winning both the national book award and the pulitzer prize (d) was published in 1982 and which, winning both the national book award and the pulitzer prize, brought her the widest acclaim (e) was published in 1982, winning both the national book award as well as the pulitzer prize, and bringing her the widest acclaim