Diagram E : This represents electron capture. A proton captures an electron and becomes a neutron and an electron neutrino.
Diagram F : This represents a neutrino-neutron collision. A neutron absorbs a neutrino and forms a proton and an electron.
Diagram G : This represents an antineutrino-proton collision. A proton absorbs an antineutrino and emits a neutron and an electron.
Diagram H : This represents an electron-proton collision. They collide and emit a neutron and an electron neutrino