Choose all the apply. The is/are used after introductory elements within a sentence.
period
comma
exclamation point
question mark
semicolon
colon
comma followed by a conjunction

The correct answer is "Comma".

Explanation:

These same introductory components comprise agreements, phrases as well as expressions that show up before the actual main clause including its statement. Fundamentally, they're preparing your readers for whatever the phrase has become, or perhaps the flesh including its paragraph as well as a message.

Both other decisions aren't related to something like the sort of situation in question. So the above solution is the correct one.

Iam thinking it might be true