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B. 42
To find how many of the students were girls, divide the total number of students (98) by the total parts in the ratio (3+4=7) to find each part. Then multiply the number of parts for girls (4) by the individual part value.
98 / 7 = 14
14 x 4 = 56
Therefore, there were 56 girls who participated in the community volunteer clean-up project.