My mother went to the grocery store for buying food for our upcoming camping trip.

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using an infinitive, what is the correct way to replace the underlined words?

a) my mother went to the grocery store to buy food for our upcoming camping trip.
b) my mother went to the grocery store for to buy food for our upcoming camping trip.
c) my mother went to the grocery store to be buying food for our upcoming camping trip.
d) my mother went to the grocery store for to be buying food for our upcoming camping trip.

tom comes from a southern part of the hemisphere and down in the south they talk with a lot of slang the family doesnt quiet understand what tom is tryna say becaus ehe talks like a three year old but near the end they finally try and desihper toms letter and its a success i have no idea hwta book this is or how to even answere this question honeslty but i am a really fast typer so i did this actually incrediably quick with the swiftness of the flash

d. cassius cannot believe that a weakling like caesar has become so great.