In the sentence We stayed inside the building during the storm, which of the following is a phrase?

• A. inside
• B. inside the building
• C. during
• D. the building during the storm

In the sentence What she worries about is the general decline in American language-learning skills, the underlined part is correctly classified as which of the following?

• A. Noun clause as subject
• B. Noun clause as object of preposition
• C. Adverb clause
• D. Adjective clause