100 points for this i need it asap Which of the following is an example of a concurrent power?

Signing a trade treaty with a foreign country
Building a new interstate highway
Collecting taxes
Determining the legal marriage age

a system of cooperative federalism emerged, as the powers of the federal government expanded.

randy pausch was a famous mathematician, writer and lecturer who is particularly famous for his last speech, given in 2007, "the las lecture", because he illustrates why one's dreams need to be pursued in a logical order if success is to be obtained, option c. at this time, pausch had been diagnosed with terminal cancer so he told the audience to follow their childhood dreams, which were possible to achieve. it has been recognized as one of the best motivational speech around the world.