Apply the Fourier-transform definition over the nonzero support: $X(\omega)=\int_{-1}^{1}e^{-j(\omega-10)t}dt$.
Symmetric integration yields $2\sin(\omega-10)/(\omega-10)$, with limiting value 2 at ω=10. This is **A**; modulation shifts the rectangular pulse spectrum without adding an unrelated constant phase factor.
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