Which one among the following is the richest source of vitamin C?

Which one among the following is the richest source of vitamin C?

Apple
Banana
Amla
Papaya
This question was previously asked in
UPSC CISF-AC-EXE – 2017
Amla (Indian gooseberry) is considered one of the richest natural sources of vitamin C.
Amla contains an exceptionally high concentration of ascorbic acid (Vitamin C) compared to most other fruits.
While apple, banana, and papaya do contain vitamin C, their levels are significantly lower than that found in Amla. Citrus fruits and guavas are also known for high vitamin C content, but among the options given, Amla is superior.