The correct option is
B (800+25)÷25Let's discuss both the options one by one:
a.)
600÷(20+5)=600÷25=24 as depicted in figure below,
Applying distributive property,
600÷(20+5)=600÷20+600÷5,
600÷20=30 as depicted figure below,
and
600÷5=120, as depicted in below figure
∴ 600÷20+600÷5
=30+120=150 but
600÷25=24
⟹600÷(20+5)≠600÷20+600÷5
Therefore, this expression:
600÷(20+5), will not follow distributive property.
b.)
(800+25)÷25
=825÷25=33 as depicted in figure below,
Now, applying distributive property,
(800+25)÷25=800÷25+25÷25
800÷25=32, as depicted in figure below,
and
25÷25=1, as depicted in figure below,
∴800÷25+25÷25=32+1=33,
and
825÷25=33 also.
⟹(800+25)÷25=800÷25+25÷25,
Therefore, expression
(800+25)÷25, follows distributive property. (b) is the correct option.