Question

Deep (1)cognition deep thinking, is vital.

(1)

a)no change
b)cognition, deep thinking, is vital.
c)cognition, deep thinking is vital.
d cognition: deep thinking, is vital.

On this one I answered a) using a comma to separate each description.
was that correct?

Answer 1

I would go with C on this

Answer 2

I vote for b.

Answer 3

I agree with b.

"deep thinking" is an appositive to "deep cognition. Appositives need to be set off by commas -- which means two commas, not one!

http://grammar.ccc.commnet.edu/grammar/commas.htm
See #4.

Answer 4

Thank you : )

Answer 5

B is correct. The comma rule says to set an appositive off with a comma. Deep thinking is indeed in apposition.