Correct answer
Making a U-turn.
R-304 prohibits a U-turn, reversing the direction of travel. It does not itself prohibit a left turn, which must still comply with other rules and signs. It is not a ban on every change of course. The three options distinguish a U-turn, a left turn, and both manoeuvres together.
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All options
Turning left.
Making a U-turn.
Making a U-turn and turning left.
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Sign R-304: no u-turn
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