Suppose an Intense Meteor Shower Occurs on a Certain Date

Multiple Choice

Suppose an intense meteor shower occurs on a certain date this year, but there was no shower last year on that date, and it turns out that there is no shower next year on that date. A likely explanation is that:

A) this year Earth passed through the orbit of a recently disintegrated comet, one for which the debris is not yet distributed along the entire orbit.
B) a small comet has passed through Earth's atmosphere.
C) the meteor shower is the remnant of a comet that had a semimajor axis larger than 1 au and a period longer than 1 year.
D) the debris along the orbit was mostly fine dust, which has been blown away by the solar wind.