Step 1: Understanding the Fold and Cut Process.
The sheet is folded twice, and the cutting follows a specific pattern. When unfolded, the cuts will form a symmetrical pattern based on the folding structure.
Step 2: Identifying the Correct Pattern.
Upon unfolding, the cut pattern creates a shape that matches the one shown in option (c) C.
Step 3: Conclusion.
Thus, the correct pattern formed is option (c) C.
\[
\boxed{\text{The correct answer is (c) C.}}
\]