A is wrong because the persona "customers" is mentioned.
The correct answer is B.
Saying "help" our customers is not specific enough to the desired outcome. We know the situation is supply chain interruptions, but what help to the customers need?
A better "how might we" sentence that includes the outcome would be, "How might we increase visibility into the shipping delivery process, to help customers understand the increased wait time that may be associated with supply chain interruptions?"
C is wrong because HMW should not include the solution hypothesis.
https://trailhead.salesforce.com/content/learn/modules/challenge-framing-and-scoping/create-effective-how-might-we-statements