Answer: C

Reasoning: Resin-modified glass-ionomer cements chemically bond to dentin, release fluoride, tolerate moisture and show excellent long-term retention in cervical Class V erosion/abrasion lesions—often with 100 % retention at 2 years—making them more dimensionally stable than conventional GIC, compomers or acid-etch composites in “unstable” erosive sites [Peumans et al., 2003, PMID 15002948; Onal & Pamir, 2005, PMID 16329418].