a) Source A comes from a photograph from the Guardian archive so the source could be positive. Source A does not show me that the the British soilders are victim in the bloody sunday riots. It shows me that there are a few injured people lying on the ground as i can see it in the source.
However, Source D contradicts Source A as the source tells me that Britian was treated with bad attitude as the source tells me that"Britian has done a lot for Ireland. I think they should give (the country) to us, but i don't think it should be violence that will bring about it."
The purpose of this source is to make people understand that british people was the one who got hurt during the bloody sunday riots.
Therefore, the source is reliable.