A storage ring of radius 45 m at a high energy accelerator has a 18A circulating beam of electrons. The electrons are moving so fast that their speed can be taken as $3 \mathrm{x} {10}^8\mathrm{m}/\mathrm{s}$ with an insignificant error. Number of electrons in the beam is :

• A

  $1.06 \mathrm{x} {10}^{14}$

• B

  $16 \mathrm{x} {10}^{16}$

• C

  $2.24 \mathrm{x} {10}^{16}$

• D

  $4.8 \mathrm{x} {10}^{15}$