The answer is D - present perfect tense. A would be - gave. B would be - gives. C would be - had given.
Answer:
In 1961, John F. Kennedy was inaugurated as the 35th president of the United States, Soviet cosmonaut Yuri Gagarin became the first human to fly in space, Freedom Riders took buses into the South to bravely challenge segregation, and East Germany began construction of the Berlin Wall
Explanation:
Hey there!
1) A She mixed flour, while sniffing flower
2) C Time flies like an arrow; Fruit flies like a banana
3) B A horse is a very stable animal
