Electricity question(motor)?

Electricity question(motor)?

which one of the following motor types would most likely provide a 100-hp size? 

a. split phase 
b. two-value capactior 
c. compound DC 
d. three-phase 

I know B is not an answer but I have no clue besides that. 

which of these split-phase motor tpes are useful for varibled] speed applications? 

a. internal-resistance 
b. capacitor-start 
permanent-split capacitor 
d. two-value capacitor

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