This is one of the hardest questions I struggle with. The answers are highlighted below in yellow. The wording is confusing to me and I can't seem to crack the code. I understand A... For B, why is there another Gly? and I know that X represents a placeholder. I just have a hard time visualizing this.

(20 points) A peptide was analyzed with the following results. What is the primary sequence of the peptide? (A) Two cycles of Edman degradation of the peptide yielded the first-cycle product, the PTH derivative of threonine, and the second-cycle product was PTH-Gly. (B) Treatment of the peptide with cyanogen bromide resulted in two peptides, one containing a Gly N-terminus, and the other with a Thr N-terminus. (C) Treatment with trypsin, gave three products, and Edman sequencing of each product showed the single amino acid His, one tetrapeptide had an N-terminus of Thr, and a second tetrapeptide had an N-terminus of methionine. (D) Treatment with chymotrypsin gave three products, and after Edman sequencing, a dipeptide had an N-terminus of Arg, a tripeptide had an amino-terminus sequence of Thr-Gly-Phe, and a tetrapeptide had an N-terminus. The original peptide is: Connerts but mid (A) Thr-Gly (B) Thr-Gly-X-Met; and Glv-X (C) Lys/Arg*His, Thr-Gly-Lys/Arg-Met, Met-Gly-X-Lys/Arg So, Thr-Gly-Lys/Arg-Met-Gly-X-Lys/Arg-His (D) Phe/Tyr-Arg-X, Thr-Gly-Phe, so Thr-Gly-Lys/Arg-Met-Gly-Phe/Tyr-Arg-His