Which is a complex sentence
a. the director advised her clients, but they did not always follow her guidance
b. we drove to the airport and picked up my mom's cousins, who flew in from toronto
c. upon hearing the news, marianne cried tears of joy, and sean hugged his mother
d. the administration made drastic changes, but the employees ignored the new instructions

C) we drove to the airport and picked up my cousins, who flew in from Toronto

Explanation:

its right

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