First we found out what the sentence is in english. En mi niñez, yo____. No me gustaba hablar. In english it is saying "In my childhood, I____. I did not like to talk. Next we narrow down our answers by finding out what they mean in english and putting them into the sentence. Era callado means It was quiet which if you were to put in the sentence it would be written as "In my childhood, It was quiet. I did not like to talk." which doesn't really make sense so it's not right. me soñaba means I dreamed and put in the sentence is "In my childhood, I dreamed. I did not like to talk" Which doesn't really make sense so it's not right. hacía travesuras means did mischief and put in the sentence would be "In my childhood, I did mischief. I did not like to talk. which makes pretty good sense. iba al mercado means I was going to the market and put into the sentence would be "In my childhood, I was going to the market. I did not like to talk" which to me makes no sense. Therefore, hacía travesuras is the correct answer.
sorry for the long wait but hope you found this helpful and correct.
