Write a balanced equation for the transmutation that occurs when a nitrogen-13 nucleus emits a positron.
A.
137N→138O+0−1e
7
13
N
→
8
13
O
+
−
1
0
e
B.
137N→136C+01e
7
13
N
→
6
13
C
+
1
0
e
C.
137N→95B+42He
7
13
N
→
5
9
B
+
2
4
H
e
D.
137N→137N+00γ
7
13
N
→
7
13
N
+
0
0
γ