Let H1 = {0, ±2, ±4, ±6, ....}
H2 = {0, ±3, ±6, ±9, ....}
and Z = {0, ±1, ±2, ±3, ....},
then the true statement is
1
(H1 ∪ H2, +) is not a subgroup of (Z, +)
2
(H1, +) is not a subgroup of (Z, +)
3
(H2, +) is not a subgroup of (Z, +)
4
(H1 ∩ H2, +) is not a subgroup of (Z, +)