Which of the following is true about how weathering affects fractured rocks?

A) weathering affects rocks from the outside in, forming an outer weathered zone or rind
B) weathering attacks corners from three sides and so these are preferentially removed
C) preferential weathering along fractures can cause blocks to become rounded
D) all of these

All the statements provided are true regarding how weathering affects fractured rocks. Weathering indeed affects rocks from the outside in, forming an outer weathered zone or rind. It also attacks corners from three sides, which leads to their preferential removal. Additionally, preferential weathering along fractures can cause blocks to become rounded, as the weathering processes exploit these weaknesses in the rock structure.