Percentage passing sieve no 200 = 70% , Liquid limit = 65% and Plasticity index = 20% , the classification of this soil according to the AASHTO Method is:a.A-5b.Nonec.A-4d.A-7-5

To classify the soil according to the AASHTO Method, we need to follow these steps:

1. First, we need to look at the percentage passing sieve no 200. In this case, it is 70%. According to the AASHTO classification system, if more than 35% of soil particles pass through sieve no 200, the soil is classified as a fine-grained soil.

2. Next, we need to consider the Liquid Limit (LL) and Plasticity Index (PI). The LL is 65% and the PI is 20%.

3. According to the AASHTO classification system, a soil with LL greater than 41% and PI between 10 and 20 is classified as A-7-5.

So, the classification of this soil according to the AASHTO Method is d. A-7-5.