The correct option is C French
From the key, we know that each star in the pictograph represents 1 mark.
Thus,
Marks obtained in English: 8 × 1 = 8
Marks obtained in Science: 6 × 1 = 6
Marks obtained in Mathematics: 6 × 1 = 6
Marks obtained in French: 5 × 1 = 5
Hence, Benny scored the least in French.