Acell is if it lacks a nucleus and membrane-bound organelles.
a.
autotrophic
b.
prokaryotic
c.
eukaryotic
d.
heterotrophic

B. prokaryotic because prokaryotic cells lack a nucleus and membrane-bound structures.

The correct answer is Option B.

Explanation:

For the given options:

Option A: Autotrophic organisms are defined as the organisms which produce  their own food for survival. For Example: Green plants

Option B: Prokaryotic organisms are a unicellcular organisms which lack a membrane bound organelles like mitochondria, nucleus etc.. For Example: Bacteria.

Option C: Eukaryotic organisms are multicellcular organisms which have membrane bound organelles like mitochondria, nucleus etc.. For Example: Human beings.

Option D: Heterotrophic organisms are defined as the organisms which do not produce their own food. For Example: Tigers, Lions etc..

Hence, the correct answer is Option B.