Use the Following Information to Answer the Question

Multiple Choice

Use the following information to answer the question. These two headlines are on the same topic.
Headline A: Gaining weight after giving birth for the first time leads to pregnancy- related diabetes during second pregnancy, a new study finds.
Headline B: Women who gain weight after giving birth for the first time dramatically increase their risk of developing pregnancy- related diabetes during their second pregnancy, a new study suggests.
-Was the study referenced most likely a controlled experiment or an observational study?

A) Controlled experiment
B) Observational study