Which of the following halides can be converted directly into its Grignard reagent with $\mathrm{Mg}$ in dry ether without the reagent destroying itself?

Grignard reagents are destroyed by acidic O-H and N-H groups in the same molecule. The phenolic $\mathrm{OH}$, $\mathrm{COOH}$ and $\mathrm{NH}{}_2$ groups would protonate the reagent, whereas the methoxy ether group is inert and the ether oxygen even helps solvate Mg.