very hard writing questions

The 1922 silent film The Toll of the Sea is notable both for being the first commercial movie shot entirely in Technicolor and (Chinese American actor Anna May Wong was starring in it) .

A Chinese American actor Anna May Wong was starring in it
B Chinese American actor Anna May Wong stared in the film as well
C for starring Anna May Wong, a Chinese American actor
D its star was Chinese American actor Anna May Wong
E it stared Anna May Wong, a Chinese American actor

the answer is C. is it because the “both for” that the next word after and has to be “for”?

Our tour guide requested that , while hiking through the national park , (our garbage not be thrown on the trails)

A our garbage not be thrown
B our garbage should not be thrown
C not to throw our garbage
D we did not throw our garbage
E we not throw our garbage

here the answer is E and i choose C

For the first one, it is indeed C because it has to maintain parallelism, i.e. “notable both for blah blah blah and for blah blah blah”.

Had the sentence read, “The 1922 silent film The Toll of the Sea is notable because it was the first commercial movie shot entirely in Technicolor and (Chinese American actor Anna May Wong was starring in it)”, out of the existing answer choices, which one would be correct? I’ll let you decide.

For the second question, realize that in this type of sentence structure, you should be able to remove the phrase in the middle of the two commas and still have a correct sentence. If you choose C and you remove the middle phrase, your sentence would read, “Our tour guide requested that not to throw our garbage.” Doesn’t sound right, does it?

Plug in E and remove the middle phrase and your sentence reads, “Our tour guide requested that we not throw our garbage”, which is perfect.

thx! and i would choose C again, i think if there was “the” before “chinese” it would have been ok