C operators — match operator to its description List I (Operator) A. ?: (ternary) B. [ ] (subscript) C. % (percent) List II (Description) 1. Modulus (remainder) 2. Array expression / element access 3. Conditional (if-else in expression form)

Introduction / Context:
Operator literacy is central to reading C code quickly and safely. This match tests three frequently used operators that influence control flow, indexing, and arithmetic results.

Given Data / Assumptions:

• Standard ISO C semantics.
• Integer operands for modulus.
• Zero-based array indexing.

Concept / Approach:
The ternary operator implements an inline conditional; the subscript operator indexes arrays/pointers; and the percent sign performs remainder arithmetic on integers. We map each symbol to its canonical description from the C grammar and standard library usage.

Step-by-Step Solution:

Verification / Alternative check:
Compile small snippets: int x = cond ? a : b; selects between values; arr[i] is *(arr + i); 7 % 3 yields 1 in C.

Why Other Options Are Wrong:

• Swapping array access and modulus descriptions would misrepresent syntax and behavior.
• Placing “conditional” on [] or % is semantically incorrect.

Common Pitfalls:
Assuming % is a true mathematical modulus for negatives—C defines remainder with implementation-defined sign rules in older standards; modern C17 specifies truncation toward zero.

Final Answer:
A-3, B-2, C-1