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Help!!! BRAINLIEST!!!
Which is the topic sentence of the following paragraph?
Determining the order of ideas in a paragraph is essential to producing a clear and understandable paragraph. A writer who aimlessly presents ideas the reader will not be very successful in presenting his or her ideas. Topic sentences help writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea. Adding support is key.

a) Determining the order of ideas in a paragraph is essential to producing a clear and understandable paragraph.

b) Topic sentences help writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

c) A writer who aimlessly presents ideas the reader will not be very successful in presenting his or her ideas.

d) Adding support is key.