Step 1: Understanding the Concept:
Citrus classification has been defined differently by various taxonomists (such as Swingle, Tanaka, and Hodgson) based on morphological and horticultural characteristics.
Step 2: Detailed Explanation:
- Statement I is true: Mandarins (Citrus reticulata) have an outer rind that is loosely attached to the inner flesh, allowing them to be peeled easily by hand. Thus, they are widely known as "loose-skinned oranges."
- Statement II is false: R.W. Hodgson (1967) classified mandarins into four distinct groups based on morphological, quality, and horticultural parameters:
1. Satsuma mandarin (C. unshiu)
2. King mandarin (C. nobilis)
3. Willowleaf (or Mediterranean) mandarin (C. deliciosa)
4. Common mandarin (C. reticulata)
Because Hodgson used four categories, the claim of three groups in Statement II is incorrect.
Step 3: Final Answer:
Statement I is true, but Statement II is false, matching Option (C).