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ooooooo.. thankyewwwwwwwwwwwwwwwwwwwwwremove 3 and sin from the eq has they have no units... this gives you L(a^2/P)=QT^2
now put their units.. m(m^2/P)=Qs^2.. by solving this, u will have QP=m^3/s^2... or m^3s^-2.... now search through the answers whose product can give you m^3s^-2.. and its B.. (m^2) * (ms^-2)