The sentence which uses correct punctuation is C. In time, of course, all issues get resolved, but not necessarily in the way you would like.
In A, the comma before <em>he was concerned </em>should be a dash. In B, there should be a colon before <em>a flashlight, </em>not a semi colon. In D, there should be a comma before <em>yet, </em>and not a colon.
It's actually
B. WBR believes that bicycles can transform lives by providing independence
It was a good day for ice cream.
Because it is punctuated, has a subject and the meaning is the clearest out of those three.
The first and last sentences are not complete.
I was told something crazy happens!
foot
Two or more syllables that together make up the smallest unit of rhythm in a poem. For example, an iamb is a foot that has two syllables, one unstressed followed by one stressed. An anapest has three syllables, two unstressed followed by one stressed.
