Select all of the following baked goods which are leavened by a physical leavening agent. Yeast bread Croissant D Brownies Whipped cream Pie crust

## Step 1<br />The problem asks us to identify which of the given baked goods are leavened by a physical leavening agent. A physical leavening agent is a substance that causes a dough or batter to expand, making the product light and porous. This is typically achieved through the use of yeast or baking powder.<br /><br />## Step 2<br />Yeast bread is leavened by yeast, which is a biological leavening agent, not a physical one. Therefore, yeast bread is not a correct answer.<br /><br />## Step 3<br />Croissants are leavened by yeast, which is a biological leavening agent, not a physical one. Therefore, croissants are not a correct answer.<br /><br />## Step 4<br />Brownies are not typically leavened. They rely on the chemical reaction between the baking powder and the acidic ingredients to create a light and fluffy texture. Therefore, brownies are not a correct answer.<br /><br />## Step 5<br />Whipped cream is not leavened. It is simply whipped cream. Therefore, whipped cream is not a correct answer.<br /><br />## Step 6<br />Pie crusts are not typically leavened. They rely on the fat content to create a flaky texture. Therefore, pie crusts are not a correct answer.