Which of the following sentences is not coherent?
Select one:

a.
Summer is the smell of mowed grass, the sound of outdoor concerts, and the way grilled hamburgers taste.

b.
The whisper of leaves, the gurgle of water, and the chirp of birds made me feel peaceful.

c.
Succeeding at team sports requires conscientiousness, discipline, and cooperation.

d.
For the meeting, everybody was required to be silent, serious, and responsible