In debugging, which concept refers to the order in which errors occur and the line numbers causing them?

• A. Queue
• B. Heap
• C. Stack
• D. Tree

Answer: (C)

In debugging, the mechanism that tracks the sequence of calls and shows where each issue originates is the call stack, along with the stack trace. The program keeps function calls on a stack; as functions are invoked, their frames are pushed, and as they finish, they are popped. When an error happens, the runtime provides a stack trace that lists the chain of function calls that led to the fault, including the exact line numbers where those calls occurred. This lets you see both the order of execution and the precise locations in the code that contributed to the error. A queue handles processing items in arrival order, a heap manages prioritization, and a tree is a hierarchical data structure—none of these directly reveal the recent call path and line locations like the stack trace does.