How were the japanese able to surprisehow were the japanese able to surprise the us at pearl harbor?

a. japanese land forces had invaded hawaii unnoticed.
b. japanese submarines invaded pearl harbor unnoticed.
c. apanese airplanes had flown to the us mainland unnoticed.
d. japanese aircraft carriers had approached hawaii unnoti the us at pearl harbor?

Which of these marketing methods henry ford sell the model t to many people who had never before owned a car? a) offering free maintenance on cars for a full year b) airing television commercials with memorable slogans c) advertising with the new communication outlets such as radio d) offering many different colors and models for buyers to choose from