The correct answer is C. Improving bicycle lanes would reduce road accidents.
Step-by-step explanation:
A claim is a statement that reflects the position of someone towards some issue or situations, considering a claim focuses on the position of the speaker or writer this should go beyond reporting facts or expression opinions, instead claims should state a position that is arguable, which means the claim needs to be explained and supported with evidence for the audience to consider it as valid and it should be defensible, which means the author of the claim should be able to prove it by using reliable and relevant evidence. Considering this, the sentence that is an arguable and defensible claim is "Improving bicycle lanes would reduce road accidents", because this statement clearly shows a position and not a fact or opinion, and this requires information to be proved (debatable) and it is possible the author can show it as valid (defensible) by explaining to the audience the reasons why improving bicycle lanes would reduce road accidents.