The necessary and proper clause in article 1, section 8 of the constitution gives .
a)implied
b)expressed
c)ex post facto

Option A, implied is the right answer.

By contrast, the Necessary and Proper Clause clearly grants incidental authorities upon Congress. This Necessary and Proper Article is sometimes called the elastic clause. This clause comes under the section VIII of the Article I, in the constitution of the United States. The Necessary and Proper clause empowered the Congress to enact the regulations required for the performance of its other authorities instituted by the Constitution. Therefore, this  Necessary and Proper Clause provided Congress with the implied powers.

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: