Here are the various saving options:
A) 30% off - saves 0.30*$384 = $115.20
B) $100 off - saves $100
C) 5% off - saves 19.20, plus $75 saves $94.20
D) 10% off saves $38.40, plus $50 saves $88.40
The coupon that is the best deal is
A) Save 30% on any TV
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For options C and D, the wording suggests the dollars-off come before the percent-off. In that case, the savings is even less than indicated here.