[求助]弱弱的请教一下

Shipping Clerk: The 5 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. 4 shipments were sent to Truax Construction last week, only 3 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 1 of the shipments sent to Truax Construction last week was specially ordered

B. at least 1 of last week 's specially ordered shipments did not consist of building supplies.

C. at least 1 of the shipments sent to Truax Construction were not sent out on Thursday of last week.

D. at least 1 of the shipments that were sent out on Friday of last week was sent  to Truax Construction .

E. at least 1 of the shipments sent to Truax Construction last week was sent out before Friday.

Answer:E

我想请教一下，如何排除C,D两项呢？

感激!

the same confused，waiting for the detailed interpretion.