Tipped his hat politely
because a complete predicate includes the verb and all the words that tell what the subject is or what it does.
Al though Social Media is so great for us to keep in contact with our friends, It really impacts the mental health of millions of teens today. Seeing your friends post pictures together, excluding you is so painful, and is the number 1 reason why I wish social media didn't exist. In addition, seeing beautiful models, and using filters to make yourself look better online, ruins your self esteem, standards, and overall image of the beautiful person you are. Don't let social media change you.
I believe the correct answer is B. The modifier "wearing a blue dress" is placed far from the noun which is supposed to modify - Stacey. Such as it is, it could easily be attributed to another noun, the stage. It would seem that the stage was wearing a blue dress, rather than Stacey. This is easily fixable with a comma between "stage" and "wearing".
The C and D sentences are also a little bit awkward, but they don't contain a misplaced modifier.
