Sentence Correction (SC) | The Planned Parenthood representative suggested

I don't like this question.

Both A and D makes sense.

The representative can encourage (or made a suggestion in the past) to parents who currently have post-pubescent children.

OR

The representative can encourage (or made a suggestion in the past) to parents who HAD post-pubescent children. (aka their children grew up)

In addition, post-pubescent children by definition is any children older than 18. A parent call his 35 year old son post-pubescent children. It sounds ridiculous, but it is
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