Which of the following is the earliest written work on Tamil grammar?

In the Gandhara School of Art, initially, blueschist and green phyllite were used. When did stucco completely replace stone as the main material used by Gandhara School sculptors? 

The following item consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below :

Statement I

The United Provinces during Non-Cooperation became one of the strongest bases of the Congress.

Statement II :
The literary outcrop of Non-Cooperation in Bengal was quite meagre compared to the days of the Swadeshi agitation.

The following item consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below :

Statement I

The Oudh Kisan Sabha established in $1920$ failed to bring under its wing any Kisan Sabhas.

Statement II 

The Oudh Kisan Sabha asked the Kisans to refuse to till bedakhli land, not to offer hari and begar.