The correct answer for this question is A) It explains that at least one son must join the church (according to his dad)
The wording of this paragraph leads us to believe that the expression ''as the tithe of his sons'' demonstrates <u><em>how his father intended for at least one of his sons to serve the church</em></u>. This phrase denotes that none of his brothers chose to serve the church and had instead chosen different paths which led his dad to offer him as a last resource.
It could also imply the importance of church for his dad however thats entirely subjective.
This paragraph does not mention his brother's intelligence and definitely does not imply that he does not have a choice hence the wording ''my father intending to devote me (...)'' meaning his dad tried to offer him but he later decided otherwise.
Hope this helps!
