B) The danger from European interference
"<span>The former astronaut gave an inspiring opening address to the crowd of excited, fascinated students" is the best choice, although a comma could technically be placed after "inspiring" </span>
The is a determiner, first is a number, professional is an adjective, baseball is an adjective, league is a noun, was is a verb, later is an adverb, started is a verb, in is a preposition, 1871 is a number.
