As we know all the above four plants are dicots telling that all are with reticulate venation

in calotropis and neem we can find opposite phyllotaxy
and in chinarose we can find spiral or alternate phyllotaxy and in alstonia we can find whorled phyllotaxy
in calotropis and neem each node contains two leaves
and in China rose each node contains one leaf
in alstonia and nerium we can find more than two leaves

Whorled, simple leaves with reticulate venation are present in Alstonia.

Alstonia is a genus of flowering plants in the family Apocynaceae. It consists of around 40 species, mainly found in tropical and subtropical regions. Alstonia species are commonly known as devil trees or milkwoods.

Whorled Arrangement:
In botany, the term "whorled" refers to the arrangement of leaves or other floral parts in a circular pattern around the stem. In the case of Alstonia, the leaves are arranged in whorls, meaning that multiple leaves arise from the same node on the stem in a circular arrangement.

Simple Leaves:
Simple leaves are those that consist of a single leaf blade, as opposed to compound leaves that have multiple leaflets. In Alstonia, the leaves are simple, meaning that each leaf consists of a single blade.

Reticulate Venation:
Reticulate venation is a type of leaf venation pattern characterized by a network of veins that form an intricate pattern. This pattern resembles a net or a mesh, hence the term "reticulate." In Alstonia, the veins on the leaves form a reticulate pattern, branching and intersecting with each other to create a network-like appearance.

Other Options:
a) Calotropis: Calotropis is another genus in the family Apocynaceae, but its leaves are not whorled. They are alternate, meaning that each leaf arises from a different node on the stem.
b) Neem: Neem is a tree species in the family Meliaceae. Its leaves are compound, not simple, and they have pinnate venation, not reticulate.
c) Chinarose: Chinarose, also known as Rosa indica, is a species of rose. Rose leaves are compound, not simple, and they have pinnate venation, not reticulate.

Therefore, the correct answer is option 'D' - Alstonia, as it is the only plant among the given options that has whorled, simple leaves with reticulate venation.