Which of these experiments would make use of qualitative data?

a study of different shapes to compare rolling friction values

a study of different surfaces to compare luster or shine

a study on the effects of sunlight on the growth rate of plants

a study on the change in freezing point of water when salt is added

B - A study of different surfaces to compare luster or shine.

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"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements