Answer: (ii) Loop Jamming (loop jamming)

Explanation

• Loop jamming / loop fusion (jamming) is the compiler optimization that merges the bodies of two adjacent loops that have the same range of traversal, into a single loop, so the loop control overhead runs only once.
• Loop rolling is not a standard optimization.
• Constant folding folds expressions with only constants at compile time, evaluating them at compile time (e.g. x = 3+4 → x = 7), unrelated to merging loops.
• "None of the above" is therefore wrong.

Hence the method which merges the bodies of two loops is:

$$\boxed{\text{(ii)Loop jamming (loop fusion)}}$$