You've gotten your facts wrong. The large intestine does not absorb food at all. It absorbs water and some minerals from undigested food (and in the process your faeces are formed)

To answer your query,

Fact : most of the digestion and absorption takes place in the small intestine.

(You will learn at higher levels that the the stomach actually does some absorption, but it is only for very few substances eg. certain lipid-soluble compounds like aspirin, some kinds of non-steroidal anti-infammatory drugs, and ethanol (alcohol).

Absorption is only a very minor part of the stomach's function. So the main organ involved in absorption is still the small intestine. )


Now,

'organ mainly involved in' means 'what does this organ mainly do?'


For the label "organ mainly involved in the absorption of food" , only C fits it as the other parts either do not absorb food at all or only does very minor absorption.


As for the label "organ mainly involved in the digestion of food" ,

It is correct to say that the stomach is mainly involved in digestion of food.

It is also correct to say that the small intestine is mainly involved in digestion of food (in addition to absorption)

So for this label, either B or C will fit.


This label is not asking 'which organ does most of digestion?'


Therefore, only (3) is the correct answer among the four.

However, should the following occur :

These two options appear, and they are

① C,B

and

② C,C


② would be the better answer.


But this is unlikely to happen as both could be considered to be a correct answer. The setters would make the options unambiguous to choose from.

thanks for the very detailed explanation!

Welcome