Step 1: Apple varieties.
"Red Chief" is a famous variety of apple. Hence A → III.
Step 2: Mango varieties.
"Arka Aruna" is a well-known hybrid variety of mango released by IIHR, Bengaluru. Hence B → I.
Step 3: Ber varieties.
"Illiachi" is a popular variety of Ber. Hence C → II.
Step 4: Pear varieties.
"Bartlett" is a famous variety of pear. Hence D → IV.
Step 5: Conclusion.
The correct matching is A - III, B - I, C - II, D - IV.