Carbohydrates are commonly stored as starch in plant storage organs. Which of the following five properties $(A-E)$ make starch useful as a storage material?
$(a)$ Easily translocated
$(b)$ Chemically non-reactive
$(c)$ Easily digested by animals
$(d)$ Osmotically inactive
$(e)$ Synthesized during photosynthesis
Useful properties:

• A
  $b$ and $c$
• B
  $b$ and $d$
• C
  $a, c$ and $e$
• D
  $a$ and $e$