Step 1: Identify the construction.
It is an imperative sentence (“Drive faster”). Imperative tag questions typically take “will you?” (or “won’t you?” for softer invitations). Step 2: Match tone and grammar.
Here it is an order (not a polite invitation). The neutral, standard imperative tag is “will you?”.
(A) “Won’t you?” sounds like a polite request/invitation.
(C) “You must” is not a tag; it changes meaning.
(D) “Can’t you?” questions ability/complains, not a tag echo.
\[
\boxed{\text{(B) Will you}}
\]