Answer:
A) Correct as is.
Step-by-step explanation:
This is what the correct version of the passage looks like:
When their ships came safely into port, they said it was Woden’s breath that had filled their sails and wafted their vessels over the blue waters.
The version B isn't correct as their ships, and not there ships should be written. The words their and there often get mixed up because of their similar pronunciation. Their is the possessive form of they, while there means in or at that place.
The version C is wrong because it should be their sails and not there sails. The explanation is the same as in the previous case.
In the version D we have they're ships instead of their ships. This is another common mistake made because of similar pronunciation. They're is a contraction of they are, while their, once again, is the possessive form of they we need here.