From the triangle
y+z+180-x = 180
y+z = x
1. y = 180 – x
Substituting in the equation, y+z = x
180 + z = 2x
If angle x is obtuse(specifically equal than 120), there is a possibility of this equation holding true.
But there can be a lot of combinations for angle z and y for which this equation will hold good.
Therefore, we cannot clearly predict which side will be longer.
Hence, insufficient.
2. y = z = 60
When this happens, the triangle will become an equilateral triangle where all sides are equal.
This alone is sufficient.(Option B)
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