[单选题]
An electron is moving about a single p :i(* qp ,w:z ot3oc5swopulw(roton in an orbit 4r6xuza hvzj 41 we5npi,7s.bcharacterized by n = 4. How many of the electrowx7 41 ,n rju456bphazeziv s.n's de Broglie wavelengths fit into the circumference of this orbit?