Which of the following conjugated dienes would not react with

Which of the following conjugated dienes would not react with a dienophile in a Diels-Alder reaction?
a.
Which of the following conjugated dienes would not react with

b.

Which of the following conjugated dienes would not react with

c.

Which of the following conjugated dienes would not react with

d.

Which of the following conjugated dienes would not react with

e.

Which of the following conjugated dienes would not react with

f.

Which of the following conjugated dienes would not react with