Consider the following nuclear reactions, \[_{92}^{238}M\to \,_{y}^{x}N+2\,_{2}^{4}He\] \[_{y}^{x}N\to \,_{B}^{A}L+2{{\beta }^{+}}\] The number of neutrons in the element L is [AIEEE 2004]

• A. 140
• B. 144
• C. 142
• D. 146