This is one of the questions that I think is poorly expressed in this lesson, and again is contrary to what your own "quick lesson" presents. My answer of "una poca simpatía" was marked incorrect, yet it is the more commonly used version, again according to your own "quick lesson." I do not see the point of frustrating students with information that they are unlikely to hear.
1] The structure is un poco de + noun
1] Un poco de is invariable. It's the same with masculine and feminine nouns. Una poca de does not exist. There is an explanation of this in the B1 grammar section.
2] Algo de + noun is tested on the B2 level hence it being the correct answer.
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