Would "se puede ver" and "se pueden ver" both be correct Spanish?

Question

[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 ..."?

Answer

In this particular case, it would probably be better, under "Your Practice", to point us towards Kwiziq Lesson ".... 6933" [or .... "5132"] - see above^, rather than ".... 6089", so as to correspond with the answer given in the Dictation.