Concept:Metamorphic rocks are formed from specific parent rocks; a pair is correct only if the parent rock matches the metamorphic product.
Explanation:Clay and shale change into slate under heat and pressure.
Limestone changes into marble, and sandstone changes into quartzite.
Thus, options A, B, and C show correct pairs.
Shale, however, does not become graphite.
Graphite is formed from the metamorphism of coal, not from shale.
Therefore, the pair
shale→graphite is incorrectly matched.
Answer:D. shale
→ graphite