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Explanation:

Number of students in section A = 20100 × 800 = 160

Number of boys in section A = 160 - 102 = 58

Number of students in section B = 18100 × 800 = 144

Number of boys in section B = 144 - 80 = 64

Number of students in section D = 17100 × 800 = 136

Number of boys in section D = 136 - 98 = 38

Total number of boys in sections A, B and D together = 58 + 64 + 38 = 160

Total number of girls in sections B, C and D together = 80 + 104 + 98 = 282

Required percentage = 282-160160 × 100

122160 × 100

= 76.25%

Hence, the correct answer is Option B

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