Multiply the Polynomials $$( 3.4 a + 7 ) ( 0.5 a - 9 )$$

Multiple Choice

Multiply the polynomials. $$( 3.4 a + 7 ) ( 0.5 a - 9 )$$

A) $1.7 a ^ { 2 } - 27.1 a - 63$
B) $1.7 a ^ { 2 } - 3.5 a - 4.5$
C) $3.9 a - 63$
D) $1.7 a ^ { 2 } - 63$