If ZINGS is written as MDGCI in a certain code, how is LUNCH written in that…

Concept: This is a letter-substitution code built on each letter's position in the alphabet (A = 1, B = 2, ..., Z = 26). Divide that position by 2; whenever the result is an exact half (a .5 value), always round DOWN to the next whole number — never up. Convert the resulting number back to the letter at that position, and repeat this independently for every letter of a word to build its code.

Application — first confirm the rule against the given clue, ZINGS → MDGCI:

1. Z is the 26th letter: 26 ÷ 2 = 13 → M

2. I is the 9th letter: 9 ÷ 2 = 4.5 → rounded down to 4 → D

3. N is the 14th letter: 14 ÷ 2 = 7 → G

4. G is the 7th letter: 7 ÷ 2 = 3.5 → rounded down to 3 → C

5. S is the 19th letter: 19 ÷ 2 = 9.5 → rounded down to 9 → I

This reproduces M, D, G, C, I exactly, confirming the halve-and-round-down rule. Now apply the identical rule to LUNCH:

1. L is the 12th letter: 12 ÷ 2 = 6 → F

2. U is the 21st letter: 21 ÷ 2 = 10.5 → rounded down to 10 → J

3. N is the 14th letter: 14 ÷ 2 = 7 → G

4. C is the 3rd letter: 3 ÷ 2 = 1.5 → rounded down to 1 → A

5. H is the 8th letter: 8 ÷ 2 = 4 → D

Cross-check: assembling these letters in order gives F, J, G, A, D — FJGAD — which matches this option exactly, using the same rounding-down behaviour verified against the given clue.