I believe it is C, but English isn't my first language.
Answer:
Both thought hieroglyphs represented sounds and tried to prove it by translating names. Both believed hieroglyphs represented sounds and looked for proof in Egypt. Both thought hieroglyphs represented sounds and tried to prove it by studying Greek monuments.
Answer:
this may be wrong but frowning is not gerund , aging is not gerund , swimming is gerund , and whining is not gerund , as well as offering is gerund !
Explanation:
hope you get it right ! sorry in advanced if you don't !
Stockpiled is the past participle.