Which of the following is an example of a nontariff barrier that restricts access to distribution networks?
a. Canada s requirement that baby food be packaged in 4.5- and 7.5-ounce containers
b. Malaysia s requirement that during prime time at least 40 percent of the songs on the radio be by local artists
c. Turkmenistan s requirement that all imports of consumer goods be approved by the State Standards Committee
d. China s policy that imported sugar be distributed only by state-owned enterprises