"Regarded to be" isincorrect.
Regarded by publishing analysts to be increased by international tensions during the Cold War, sales of the spy novel reached the zenith in the 1960s, when most Americans perceived the U.S.S.R. like a constant threat.
(A)Regarded by publishing analyststo be increased by international tensions during the Cold War, sales of the spy novel reached the zenith in the 1960s, when most Americans perceived the U.S.S.R. like
(B) The spy novel,regarded by publishing
...
Regarded by publishing analysts to be increased by international tensions during the Cold War, sales of the spy novel reached the zenith in the 1960s, when most Americans perceived the U.S.S.R. like a constant threat.
(A)Regarded by publishing analyststo be increased by international tensions during the Cold War, sales of the spy novel reached the zenith in the 1960s, when most Americans perceived the U.S.S.R. like
(B) The spy novel,regarded by publishing
...
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