The reagent that will effect the following selective conversion is

The correct answer is DDQ, CH2Cl2

Concept -

 –The p-Methoxybenzyl (PMB or MPM) group can be protected or deprotected under the same conditions as the benzyl group.

-PMB trichloroacetimidate (PMB-O(C=NH)CCl3) provides a way to protect base sensitive compounds under acidic conditions.

-There are two dimethoxybenzyl (DMB or DMPM) groups (2,4-dimethoxy and 3,4-dimethoxy), both of which can be deprotected under milder conditions than PMB.

Explanation - 

In this reaction, it is deprotected under mildly oxidizing conditions using DDQ (dichlorodicyanobenzoquinone) or strongly acidic conditions and converted to alcohol.

Conclusion:-

So, The reagent that will effect the following selective conversion is DDQ, CH2Cl2.