【单选题】

InEngland, the first calls to restrict advertising came in 1963 from the RoyalCollege of Physicians, who highlighted the health problems associated with smoking and recommended that stricter laws (150) imposed on the Sale and advertising of tobacco products. In 1971, the government and the tobacco industry reached an agreement that included the health warnings on all cigarette packets.All television commercials for cigarettes were banned starting fromAugust 1, 1965, (151) commercials for loose tobacco and cigars continued until 1991.

Non-television advertising campaigns were still allowed in the UK but came under stricter guidelines in 1986, which in particular, prevented advertisements (152) a person smoking.
A．so
B．but
C．also
D．when