This is Bhava-Vachya because the verb is main here and inability is shown.

Karmavachya only occurs in transitive verbs. Therefore, the statement 'Karmavachya occurs in both intransitive and transitive verbs' is incorrect.

Here the verb relates to the object (letter) and 'ke dwara' (by) is used, hence it is Karmavachya (Passive Voice).

'Mohan se baitha nahi gaya' has a sense of inability, which is the main identification of Bhava-Vachya.

'Yahan kaise baitha jayega' is Bhavvachya, not Karmavachya.

'Pustak padhi jati hai' is Karmavachya (Passive Voice).

'Vah pratidin school nahi jata hai' is Kartri-Vachya.

'Budhape mein theek se chala nahi jata' is Bhava-Vachya. Others are examples of Karma-Vachya.

Option (1) 'Mujhse darwaza nahi khola jata' (The door is not opened by me) is Karmavachya because door is the object, not Bhavvachya.

In 'Kisan se chala nahi jata', inability is expressed, which is Bhava-Vachya.

'Lada nahi ja saka' is an example of Bhava-Vachya.

'Bacche ne pustak padh li hai' shows the certainty of the action being completed.

In option (D), the verb is according to the subject 'Mohan', hence it is Kartrivachya.

Because of expressing inability, this is Bhava-Vachya.

To make Karmavachya, 'ke dwara' (by) is used.

Here the action of 'sitting' is in the form of inability or question, which is Bhava-Vachya.

The sentence emphasizes the object and uses 'by', hence it is Karmavachya.

The verb 'launched' is according to the subject 'India'.

An instruction or order is given here.

'Kaidi riha kar diye jayen' shows the dominance of the object (Karmavachya).