大全一道题，confuse~请教。谢谢

Traveling the back roads of Hungary, in 1905 Béla Bartók and Zoltán Kodály began their pioneering work in ethnomusicology, and they were armed only with an Edison phonograph and insatiable curiosity.

(A) Traveling the back roads of Hungary, in 1905 Béla Bartók and Zoltán Kodály began their pioneering work in ethnomusicology, and they were armed only

(B) In 1905, Béla Bartók and Zoltán Kodály, traveling the back roads of Hungary, began their pioneering work in ethnomusicology, and they were only armed

(C) In 1905 Béla Bartók and Zoltán Kodály began their pioneering work in ethnomusicology, traveling the back roads of Hungary armed only

(D) Having traveled the back roads of Hungary, in 1905 Béla Bartók and Zoltán Kodály began their pioneering work in ethnomusicology; they were only armed

(E) Béla Bartók and Zoltán Kodály, in 1905 began their pioneering work in ethnomusicology, traveling the back roads of Hungary, arming themselves only

the answer is C.  please help

A，C中选.

考试我就选A了,不知道错在哪

C：In 1905 Béla Bartók and Zoltán Kodály began their pioneering work in ethnomusicology, traveling the back roads of Hungary
            armed only with an Edison phonograph and insatiable curiosity.

这里的armed only with ....会不会有修饰歧义？

OG解释：

Choices A and B are wordy and imprecise: the phrasing suggests that Bartók and Kodály were already traveling the back roads of Hungary when they began their pioneering work, not that they traveled the back roads in order to conduct such work. Moreover, and suggests in both cases that they were armed with a phonograph in addition to being on the road, rather than while they were on the road, and only in B is misplaced before the verb armed. Choice C is correct. In choice D, Having traveled… suggests that the two had finished traveling before they began their work in ethnomusicology, and only is again misplaced. Choice E is wordy and awkwardly constructed. The question is a little easier than the average.

OG解释我也很迷糊，语法上就说only的位置有问题排除了2个选项，正确答案更多从意思上去理解

可以search一下，有讨论的，但讨论的结果也很迷糊.

不知道有没有牛人能清楚地解释一下