An observation is A. A possible explanation for events using prior knowledge.
B. Always quantitative.
C. Made using any of the five senses.
D. Always qualitative.

A! :), an observation is something you observe and make an inference/logical answer

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11