The goal of my 1st half marathon

From the website of RW, we can calculate the reasonably predicted race results from previous races. The prediction chart was calculated by Gerry Purdy in his book, Computerized Running Training Programs
https://www.runnersworld.com/tools/race-time-predictor

The prediction is:
Your predicted half marathon time is 1:41:03. That’s a pace of 7:42 per mile or 4:47 per kilometer. This prediction is based on your 5K time of 21:58, which was plugged into the equation created by Peter Riegel.

Goal A If I feel good and energetic push to this
Goal B training for this
Goal C bottom line

A: 1:40 7:40 (5K 21:15 6:50)

B: 1:45 8:00 (5K 22:15 7:10)

C: 1:50 8:25 (5K 23:30 7:30)