c
(c)

\(\text { Work } \rightarrow\left[ ML ^2 T ^{-2}\right]\)

\(n_1 V_1=n_2 V_2\)

\(\frac{(8) M _1 L _1^2 T _1^{-2}}{ M _2 L _2^2 T _2^{-2}}=n_2\)

\(\Rightarrow 8\left[\frac{ M _1}{ M _2}\right]\left[\frac{ L _1}{ L _2}\right]^2\left[\frac{ T _1}{ T _2}\right]^{-2}=n_2\)

\(\Rightarrow 8\left[\frac{ M _1}{2 M _1}\right]\left[\frac{ L _1}{ L _1}\right]^2\left[\frac{2 T _1}{ T _1}\right]^{-2}=n_2\)

\(\Rightarrow 8 \times \frac{1}{2} \times \frac{1}{4}=n_2\)

\(\Rightarrow n_2=1\)

So, unit of 8 joule \(=1 \times\) new units