Despite the controversy surrounding the invention of the telephone, because Alexander Graham Bell's design was the first to be patented, he is most often credited for the title "The Father of the Telephone".

(1)
because Alexander Graham Bell's design was the first to be patented, he is most often credited for the title

(2)
Alexander Graham Bell's design was the first to be patented because he is most often credited for being titled

(3)
because the patent that was designed by Alexander Graham Bell was the first, he is most often credited with the title

(4)
because his design was patented first, Alexander Graham Bell is most often credited with the title

(5)
the patent design by Alexander Graham Bell was the first, so he is the one most often credited with the title

OA: 4. Help me know why 5 is wrong