If a 1 M _$\odot$ Protostar Starts Out on the Hayashi Track with a on the Hayashi

Multiple Choice

If a 1 M _$\odot$ protostar starts out on the Hayashi track with a temperature of 3300 K and a luminosity of 320 L _$\odot$ , what is its approximate radius?

A) 25 R _$\odot$
B) 55 R _$\odot$
C) 75 R _$\odot$
D) 105 R _$\odot$
E) 125 R _$\odot$