What burden influenced some non-muslims to convert to islam?

Most people converted to Islam because it was a very tolerant religion and it appealed to many. However, since the question is asking what "burden" was an influence, the only one I can think of would have to be the jizya. The jizya was a special tax that non-Muslims had to pay to live under Muslim protection in Muslim lands; if they convert to Islam they wouldn't have to pay it. 

This answer would be c