Concept:
In landscape design, harmony is created by arranging plants according to height, form and visual balance.
Step 1: Lowest element.
Edges are generally the lowest plant elements used to define borders.
\[
B=\text{Edges}
\]
Step 2: Next height.
Hedges are usually taller than edges.
\[
A=\text{Hedges}
\]
Step 3: Climbers and shrubs.
Climbers may occupy vertical support and shrubs provide medium height.
\[
E=\text{Climbers},\quad D=\text{Shrubs}
\]
Step 4: Tallest element.
Trees are the tallest components in landscape planting.
\[
C=\text{Trees}
\]
Therefore, ascending order of height is:
\[
B,A,E,D,C
\]
\[
\therefore \text{Correct Answer is (C)}
\]