All of the following were considered members of the third estate except

a. wealthy merchants.
b. peasants.
c. the urban poor.
d. nuns.
e. guild masters.

Option: D. Nuns.

Explanation:

Estates were part of the old hierarchical order in society in Europe during the feudal period (Medieval Age). The first two estates: aristocrats and clergy, enjoyed the privilege in the country by holding power and not paying taxes. The third estate is known for its bourgeoisie class, peasants who paid all the taxes and had little privileges in the society. Nuns were part of the First estates which came under the clergy group.  

d. japan's attack on pearl harbor

the answer would be a).