Which line contains subjective language?

(1)"i have a dream” is the most clever speech i’ve ever read. (2)dr. king uses allusions to history in his writing. (3)reference to american songs and history adds depth to the argument. (4)king also refers to the bible in his speech.
1, 2, 3, or 4?

The answer is indeed 1

The answer to what line contains subjective language is line 1: "I Have a Dream” is the most clever speech I’ve ever read.

Objective language focuses on facts and on being unbiased. Subjective language, on the other hand, expresses feelings and opinions. In the excerpt given, the first line shows the speakers opinion about the speech "I Have a Dream". In his/her opinion, it is the most clever speech he/she's ever read. A different person may have a different opinion about the same speech. The other lines, however, focus on facts: what Dr. King uses in his writing, what effect the references add to the argument, and the use of Bible references in the speech.

what are the options?