[Reposted so as to be visible in the Dictation]
I think I can understand why "... se puede ver a las ballenas jorobadas retozando, coqueteando ..." is correct - [meaning: "... one can see the humpback whales ...", or "... you can see ..."] - after reading your Kwiziq lessons " Using se debe/se puede to say You must/you can (impersonal sentences) " [number 6933] and " Expressing instructions and general statements in Spanish with the impersonal se = one " [number 5132].
However - under 'Your Practice', you recommend the lesson " Forming the Spanish passive with se (la pasiva refleja) " [number 6089] - which seems more consistent with this answer: "... se pueden ver las ballenas jorobadas"? (i.e. with 'pueden' in the plural, and without the "a" [before the 'las']). Would this^ be a correct way of saying "... the humpback whales can be seen ..."?