The expression is evaluated according to Python's operator precedence rules. First, the innermost parenthesized expression (312) is calculated as 36. Next, the subtraction within the remaining parentheses (36-8) results in 28. The expression simplifies to 2 + 9 28 / 10. Multiplication and division have equal precedence and are evaluated from left to right. 9 28 equals 252. Then, 252 / 10 is performed, resulting in 25.2 because the / operator performs true (floating-point) division. Finally, the addition 2 + 25.2 is executed, yielding the final result of 27.2.

A. 25: This answer is incorrect. It likely results from a miscalculation or an improper application of operator precedence, possibly involving incorrect rounding or integer division.

B. 22: This is an incorrect arithmetic result. It does not follow the standard order of operations (PEMDAS/BODMAS) as implemented in Python.

D. 27.6: This answer stems from a calculation error. For example, incorrectly calculating 9 28 as 256 would lead to 2 + 25.6, which equals 27.6.

1. Python Software Foundation. (2023). The Python Language Reference: 6.17. Operator precedence. Python 3.12.0 documentation. Retrieved from https://docs.python.org/3/reference/expressions.html#operator-precedence (This table confirms the order of operations: parentheses, followed by and / (left-to-right), and finally +.)

2. Guttag, J. V. (2016). Introduction to Computation and Programming Using Python, With Application to Understanding Data. MIT Press. (Chapter 2.2, "Objects, Expressions, and Numerical Types," discusses how expressions are formed from operators and operands and evaluated based on precedence rules.)

3. MIT OpenCourseWare. (2016). 6.0001 Introduction to Computer Science and Programming in Python, Fall 2016. Lecture 2: Objects, Expressions, Numerical Types. Retrieved from https://ocw.mit.edu/courses/6-0001-introduction-to-computer-science-and-programming-in-python-fall-2016/resources/lec2/ (The lecture notes detail arithmetic operators and the evaluation order.)