please can you explain it quickly

Calculate the number-average molecular weight of polybutadiene obtained at the completion of an anionic (i.e., "living") polymerization in which 0.02 g of n-butyllithium and 10 g of 1,3-butadiene monomer are used. The molecular weights of n-butyllithium and 1,3-butadiene are 64.06 and 54.0916 g/mol, respectively. Ltfen birini sein: a. 19071 g/mol b. 13804 g/mol c. 32030 g/mol d. 8610 g/mol . / e. 25390 g/mol e. g