Consider sets \(A\), \(B\), \(C\), and \(D\) such that \(B\) is a subset of \(A\), \(C\) is a subset of \(B\), and \(D\) is a subset of \(C\). Whenever \(x\) is an element of \(B\), \(x\) must be an element of:

Summary Submit Skip Question

Based on the information provided, our sets may look like this:

If \(x\) is in \(B\), it must be in \(A\) as well since every element in \(B\) is also in \(A\).