My father warned me_______going to the West Coast because it was crowded with tourists.

A. by      B. on     C. for     D. against

My father warned me __________ going to the West Coast because it was crowded with tourists.

My father warned me ________ going to the West Coast because it was crowded with tourists.

A．by?? B．on? C．for?? D．against

My father warned me _______ going to the West Coast because it was crowded with tourists.

A. on         B. for           C. of         D. against

 My father warned me __________ going to the West Coast because it was crowded with tourists.