An example of collective voice is:
a. you are thinking of your children's future.
b. i often think about my children's future.
c. we need to think of our children's future.
d. he is thinking about his children's future.

C. We need to think of our children's future.

Explanation: collective voice is denoting a number of persons or things considered as one group or whole, this group which could either be a community, a particular racial group, gender, sexuality etc. From the given options, the one that represents an example of the use of collective voice is the corresponding to option C: we need to thing of our children's future, because it is talking about a group of people as a whole ("we").

We are here to make a better world for our children

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