[Q]: Question: "What did the Bofors canon take the place of?" Context: "After World War I the US Army started developing a dual-role (AA/ground) automatic 37 mm cannon, designed by John M. Browning. It was standardised in 1927 as the T9 AA cannon, but trials quickly revealed that it was worthless in the ground role. However, while the shell was a bit light (well under 2 lbs) it had a good effective ceiling and fired 125 rounds per minute; an AA carriage was developed and it entered service in 1939. The Browning 37mm proved prone to jamming, and was eventually replaced in AA units by the Bofors 40 mm. The Bofors had attracted attention from the US Navy, but none were acquired before 1939. Also, in 1931 the US Army worked on a mobile anti-aircraft machine mount on the back of a heavy truck having four .30 caliber water-cooled machine guns and an optical director. It proved unsuccessful and was abandoned." Answer:
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[A]: Browning 37mm

[Q]: Question: "What happened during the 40th year of the 20th century?" Context: "On 6 August 1940, Estonia was annexed by the Soviet Union as the Estonian SSR. The provisions in the Estonian constitution requiring a popular referendum to decide on joining a supra-national body were ignored. Instead the vote to join the Soviet Union was taken by those elected in the elections held the previous month. Additionally those who had failed to do their "political duty" of voting Estonia into the USSR, specifically those who had failed to have their passports stamped for voting, were condemned to death by Soviet tribunals. The repressions followed with the mass deportations carried out by the Soviets in Estonia on 14 June 1941. Many of the country's political and intellectual leaders were killed or deported to remote areas of the USSR by the Soviet authorities in 19401941. Repressive actions were also taken against thousands of ordinary people." Answer:
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[A]: Estonia was annexed by the Soviet Union as the Estonian SSR

[Q]: Question: "What was an advantage of the defenses?" Context: "From early 1944 until the days leading up to the invasion, Kuribayashi transformed the island into a massive network of bunkers, hidden guns, and 11 mi (18 km) of underground tunnels. The heavy American naval and air bombardment did little but drive the Japanese further underground, making their positions impervious to enemy fire. Their pillboxes and bunkers were all connected so that if one was knocked out, it could be reoccupied again. The network of bunkers and pillboxes greatly favored the defender." Answer:
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[A]: Their pillboxes and bunkers were all connected so that if one was knocked out, it could be reoccupied again

[Q]: Question: "What occurred in the 62nd year of the 20th century?" Context: "The long-awaited takeover of Universal Pictures by MCA, Inc. happened in mid-1962 as part of the MCA-Decca Records merger. The company reverted in name to Universal Pictures. As a final gesture before leaving the talent agency business, virtually every MCA client was signed to a Universal contract. In 1964 MCA formed Universal City Studios, Inc., merging the motion pictures and television arms of Universal Pictures Company and Revue Productions (officially renamed as Universal Television in 1966). And so, with MCA in charge, Universal became a full-blown, A-film movie studio, with leading actors and directors under contract; offering slick, commercial films; and a studio tour subsidiary launched in 1964. Television production made up much of the studio's output, with Universal heavily committed, in particular, to deals with NBC (which later merged with Universal to form NBC Universal; see below) providing up to half of all prime time shows for several seasons. An innovation during this period championed by Universal was the made-for-television movie." Answer:
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[A]:
The long-awaited takeover of Universal Pictures by MCA