Shipping Clerk: The five specially ordered shipments sent out last week were sent out on Thursday. Last week, all of the shipments that were sent out on Friday consisted entirely of building supplies, and the shipping department then closed for the weekend. Four shipments were sent to Truax Construction last week, only three of which consisted of building supplies.

If the shipping clerk’s statements are true, which of the following must also be true?

A. At least one of the shipments sent to Truax Construction last week was specially ordered.
B. At least one of last week’s specially ordered shipments did not consist of building supplies.
C. At least one of the shipments sent to Truax Construction was not sent out on Thursday of last week.
D. At least one of the shipments that were sent out on Friday of last week was sent to Truax Construction.
E. At least one of the shipments sent to Truax Construction last week was sent out before Friday.

[/quote]

Trusday's shipment => 5 specially order shipements going out for entire week + could be additional shipments
Friday's shipment => All building supplies shipments
Now => Four shipments were sent to Truax Construction last week, only three of which consisted of building supplies.

A.At least one of the shipments sent to Truax Construction last week was specially ordered. ==>> Need not be true, since 4th shipment received at Traux need not be specially ordered, it could be regular ordered as well
B.At least one of last week’s specially ordered shipments did not consist of building supplies. ==>> Need not be True, since 4th shipment received at Traux need not be specially ordered, it could be regular ordered as well
C.At least one of the shipments sent to Truax Construction was not sent out on Thursday of last week ==>> Need not be true since on thrusady additional shipments could have gone out alongwith special ordered shipments
D.At least one of the shipments that were sent out on Friday of last week was sent to Truax Construction.==>> need not be trues since 3 building supplies could have gone out on thrusday itself
E.At least one of the shipments sent to Truax Construction last week was sent out before Friday. ==> HAS to be true

I am getting - E

E for me too..

Trusday's shipment => 5 specially order shipements going out for entire week + could be additional shipments
Friday's shipment => All building supplies shipments
Now => Four shipments were sent to Truax Construction last week, only three of which consisted of building supplies.

A.At least one of the shipments sent to Truax Construction last week was specially ordered. ==>> Need not be true, since 4th shipment received at Traux need not be specially ordered, it could be regular ordered as well
B.At least one of last week’s specially ordered shipments did not consist of building supplies. ==>> Need not be True, since 4th shipment received at Traux need not be specially ordered, it could be regular ordered as well
C.At least one of the shipments sent to Truax Construction was not sent out on Thursday of last week ==>> Need not be true since on thrusady additional shipments could have gone out alongwith special ordered shipments
D.At least one of the shipments that were sent out on Friday of last week was sent to Truax Construction.==>> need not be trues since 3 building supplies could have gone out on thrusday itself
E.At least one of the shipments sent to Truax Construction last week was sent out before Friday. ==> HAS to be true

I am getting - E[/quote]
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In (E) friday refers to which week ?? not mentioned.
IMO (A) should be correct as only 3 shipments sent to Truax Construction last week consisted of building supplies, therefore the atleast one shipment has to be specially ordered as it contained something other than building supplies (note: the word "entirely" in argument).
why does it say "atleast" ? because, "building supplies" can also be a part of "special order" but the vice-a-versa is not necessarily true.

E is the OA!