What has been the general trend in media coverage of presidential politics since $1968?$

a$.$

It has gotten more superficial due to a proliferation of commentators and sound bites.

b$.$

It has gotten more perceptive due to more intelligent candidates and better$-$trained journalists.

c$.$

It has gotten more sophisticated due to a proliferation of commentators and deeper insights.

d$.$

It has gotten more detailed and does a better service to candidates and voters alike.

e$.$

It has gotten more superficial due to less intelligent candidates and lesser$-$trained journalists.