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Consider the semiconductors $\mathrm{A}$ and $\mathrm{B}$. The figure shows variation of $\ln p$ with $I / T$, where $p$ is resistivity and $\mathrm{T}$ the temperature, for the two semiconductors. Choose the correct statements (s).

1. the bandgap energy of $\mathrm{A}$ is larger than that of B.
2. the bandgap energy of $\mathrm{A}$ is smaller than that of $B$.
3. the maximum wavelength of light needed to create an electron hole pair is larger in $A$ than in B.
4. the mamximum wavelength of light needed to create an electron hole pair is smaller in $\mathrm{A}$ than in B.