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This is why many transition metal complexes are coloured - think FeSCN2+ or why colourimetry works. TM complexes aren't abosrbing in the UV-Vis range because of conjugation of multiple bonds.

Short version - BAD QUESTION. I agree that (B) and (C) are unreasonable, and (A) and (D) may be true... or not... and we lack the information to decide. With no information about the absorbance beyond the range of wavelengths given, guessing that they have similar (lack of) absorbance at...

The monomer has molecular formula C4H8O3, and so its molar mass is about 4 x 12 + 8 x 1 + 16 x 3 = 108 g/mol

It's a condensation polymerisation and so there is a second product, water, which is ejected. 1000 HOCH2CH2CH2COOH ---> H(OCH2CH2CH2CO)1000OH + 999 H2O So, 1000 x M(4-hydroxybutanoic acid) = M(polymer) + 999 x M(water), which gives M(polymer) is about 86,000 g/mol