It is B as said, they are saying to you which attribute influnce the path that incoming traffic will take, so the result will be to influence the traffic into your as, for do that you prepend your as one more time so that your neighbor will prefer another bgp update coming from another interface that maybe have much more speed (that's an example).
Metric aka MED can also influence ingress traffic in to your autonomous system though? I agree AS_PATH is the best, but technically MED would also be correct in some situations.
Commenting on my own comment here after looking through this again. The key here is autonomous-systems, plural. MED can influence ingresss if there is a single AS that has multiple ingress points to your AS. Otherwise AS_PATH or advertising a longer-prefix are your options.
to clarify setting MED won't work for an AS, two AS's away, prepending or removing as-path will
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