Final answer:
Line 2, which contains (hello), is most likely to result in an error if 'hello' is an undefined variable, leading to a reference error in many programming languages.
Step-by-step explanation:
The question asks which line of code is most likely to result in an error. Assuming the context is a programming language that follows conventional syntax such as JavaScript or similar:
- Line 1 - ("hello"): This is a string in parentheses; unlikely to cause an error.
- Line 2 - (hello): Without context, 'hello' may refer to a variable. If the variable 'hello' isn't defined, it could result in a reference error.
- Line 3 - ("100"): This is a string representing a number in parentheses; unlikely to cause an error.
- Line 4 - (100): This is a numeric literal in parentheses; unlikely to cause an error.
Based on this evaluation, b) Line 2 is most likely to result in an error because if 'hello' is not a defined variable, the code will fail when it tries to evaluate it.