The given reactions,
$I. 2 {Mn}_{2} O_{7} ⟶ 4 {MnO}_{2} + 3 O_{2}$
$II. {SnCl}_{2} + 2 {FeCl}_{3} ⟶ {SnCl}_{4} + 2 {FeCl}_{2}$
are the examples of

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intermolecular redox reaction and intramolecular redox reactions, respectively

Both reactions (I) and (II) are intramolecular redox reactions

intramolecular redox reaction and intermolecular redox reaction, respectively

Both reactions (I) and (II) are intermolecular redox reactions

answer is D.

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Detailed Solution

Some compounds, e.g. ${Mn}_{2} O_{7}$ when dissociats into $O_{2} and$ ${MnO}_{2}$ oxidation and reduction both take place.
i.e. $2 {Mn}_{2} O_{7} ⟶ 4 {MnO}_{2} + 3 O_{2}$
It is an example of intramolecular redox reaction, while reaction, such as
${SnCl}_{2} + 2 {FeCl}_{3} ⟶ {SnCl}_{4} + 2 {FeCl}_{2}$
is an example of intermolecular redox reaction