What is P (0.6 ≤ z ≤ 2.12) ?

You have to look up in your Z score table.

P (0.6≤ z≤ 2012) is the probability or area (of the bell shaped curve) between the value of z = 2.212 & z = 0.6.

To that end for z₁ = 2.12 you find an area = 0.9830 and

for z₂ = 0.6 you find an area = 0.7257

Subtract those values z₁ - z₂ = 0.9830 - 0.7257 = 0.2573

and P (0.6≤ z≤ 2012) = 0.2573 (0r 25.73%)

The answer is B. 26%