Which sentence does not contain any errors?
a.
no one else on the team is allowed to use our captain erics' equipment.
b.
let's just say, however, that my sister's friends are very interesting.
c.
my two grandparent's houses are one level, but both have a basement.
d.
i normally do not want to step on anyones' toes.

“what i heard was abominable,” said utterson. “it can make no change. you do not understand my position,” returned the doctor, with a certain incoherency of manner. “i am painfully situated, utterson; my position is a very strange—a very strange one. it is one of those affairs that cannot be mended by talking.” –the strange case of dr. jekyll and mr. hyde, robert louis stevenson write two to three sentences explaining how this passage creates suspense.