Answer:
1. The correct answer is A), President Nixon was the first president to "visit Taiwan". Richard Nixon was the first American president to visit the Republic of China in February 1972. This visit was considered very important since it encouraged strong economic ties between America and China. Option B is incorrect since President Nixon did not send troops to Vietman. Instead, in 1969 he started the "Vietnamization" policy that consisted on ending the involvement of the US in the Vietman war.
2.