Data Interpretation Practice Test 2

The ‘No-girls’ bar goes upto 42%. The ‘4-girls or more’ design bar extends from about 90% to 100%, which is about 10%. Therefore 42 + 10 = 52%, makes (B) as the right choice.
*Incidentally, in Cumulative Graph Questions, do not be misled by the upper positions of partial quantities. The top positions have nothing to do with the size or the amount of a specific division.