The drainage pattern shown in Question #6 is the same as the one shown in Question #3 - trellis. Trellis drainage will form in an area with alternating layers of hard and soft rock (B). Imagine such a place before erosion occurs. It would start out as a relatively flat area. Over time, the forces of weathering and erosion would where down the soft rock creating lowland sections while the hard rock locations would remain as uplands / hills. Rivers would then occupy the lowland areas flowing between the upland sections and carving out V-shaped valleys. Tributaries would flow down the upland slopes to the main rivers joining them at near right angles.

trellis drainage

Doming (C) produces a radial pattern whereby streams flow away from the top of the dome.

An area with uniform (i.e. similar) rock hardness as suggested in both (D) and (A) would produce a dendritic drainage pattern. Because streams can cut as easily in one place as another, their actual network pattern is the result of random flow resulting in a pattern similar to the veins of an oak leaf.

dendritic drainage (stream system in Yemen - photo by NASA)