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If \( \left(1+x+2 x^{2}\right)^{20}=a_{0}+a_{1} x+a_{2} x^{2}+\ldots \ldots \ldots+a_{40} x^{40} \), then \( a_{0}+a_{2}+a_{4} \ldots \ldots+a_{38} \) is equal to :
(A) \( 2^{19}\left(2^{30}+1\right) \)
(B) \( 2^{19}\left(2^{20}-1\right) \)
(C) \( 2^{39}-2^{19} \)
(D) \( 2^{39}+2^{19} \)
\( \mathrm{P} \)
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