The product of all the prime numbers less than 22 is closest to which of the following powers of 10?  Choose the correct choice from the following options:
A) a) 10^9	B) b) 10^7	C) c) 10^8	D) d) 10^6	E) e) 10^5
Group these numbers so as to get product close to a multiple of 10, so they can be rewritten as (2*5)(3*7)(11*19)(13*17) or 10*21*209*221   Now take out power of 10 from each number and rewrite   10*10*100*100*(1*2.1*2.09*2.21) or 10^6*(1*2.1*2.09*2.21)   =9.69*10^6=10^7   b) 10^7
<result>B</result>
The product of all the prime numbers less than 22 is closest to which of the following powers of 10?