Hello!
Answer:

Explanation:
→ We want to solve this equation:

◼ Simplify the left side:

◼ Subtract 123 from both sides:

◼ Simplify both sides:

◼ Subtract 3y from both sides:

◼ Simplify both sides:

→ The expression entered is an identity: it is true for all values.
Conclusion:
The equation 3(y+41) = 3y + 123 has infinitely many solutions.
So the answer is the option 3.