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Part $1$

The massive shift in how and where people buy calls for$\_\_\_\_\_\_\_\_\_.$

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Part $1$

A$.$

massive spending increases in advertising and sales promotion

B$.$

massive shifts in pricing strategies

C$.$

massive spending in social media for$$ brick$-$and$-$mortar retailers

D$.$

massive shifts in how store retailers operate

E$.$

massive shifts to$$ online$-$only environments for$$ brick$-$and$-$mortar retailers