Explanation:
Let's solve all of them,
A. getting paid $35 for walking dogs, then spending $10 on games
=$35-$10
=$25
B. getting paid $25 for walking dogs, then spending $25 on games
=$25-$25
=$0
C. getting paid $20 for walking dogs, then spending $5 on games
=$20-$5
=$15
D. getting paid $15 for walking dogs, then spending $10 on games
=$15-$10
=$5
Here,
Option B. matches with the above situation.
So,
Option B. is the correct answer.