Four particles are represented by symbols. $^{40}_{20}\text{W}\quad ^{41}_{20}\text{X}^{2+}\quad ^{37}_{18}\text{Y}\quad ^{37}_{17}\text{Z}$ The letters do not stand for the chemical symbols. Which particles contain the same number of neutrons?
- AW and X$^{2+}$
- BW and Z
- CX$^{2+}$ and Y
- DY and Z