Professor Stone designs a study to examine the effect of a teenage pregnancy on the career choices of the teens. Stone interviews a sample of teenage women during their pregnancy, after the birth, and one year later. Stone is using a:.1. cross sectional design2. trend study3. cohort study4. panel study5. cannot tell from the given information

4. panel study.

Explanation:

Panel study:

Panel study is a type of longitudinal study in which subject is analyzed at certain specific intervals for long period. Means, Professor Stone's study subject are teenage women and he interviewed his subjects (teenage women) at different intervals like at pregnancy, then after the birth and finally after one year.

So, panel study is used to decipher the changes in attitude of constant subjects at typical interval over a long period.

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explanation: