Which two are examples of t threats (in stride)? a. modifying a file without authorization b. claiming that a package was never received c. modifying intercepted network packets d. using sql injection to read database tables?

T threats stands for Tampering threats, which include intentional modification of files  in a way that would make them harmful to the users or also modification of packets transmitted in the network.
Modifying a file without authorization and Modifying intercepted network packets are two examples of T threats. Correct A and C.

The answer is c.  the soft ware is unable to you because it is open for the public to use. 

This is true 100%