Which one of the following is not used for construction of ecological pyramids?

In a pond ecosystem,the pyramid of numbers is ............ .

Assertion : In a food chain, members of successive higher levels are fewer in number.
Reason : Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.

Choose the correct option for the given statements:
($T$ = True,$F$ = False)
$(A)$ Pyramid of energy is always upright.
$(B)$ Pyramid of number in a sea is generally inverted.
$(C)$ Pyramid of biomass in a sea is generally inverted.
$(D)$ In most ecosystems,the pyramid of number and energy are always inverted.

Which kind of pyramid is represented by the given diagram?

Which of the following pyramid of numbers in ecology is not upright?