Final answer:
To maintain control on slippery roads, it is recommended to steer straight, ensure even brake adjustment, and stop and turn with caution, which encompasses all the options provided.
Step-by-step explanation:
For control on slippery roads, the answer is d. all of the above.' This includes a. steering as straight as possible, maintaining your vehicle so that b. your brakes should be adjusted to pull evenly, and c. stopping and turning with care. Steering straight helps maintain stability, even brake adjustment prevents uneven deceleration and potential skidding, and stopping and turning with care allows for adjustments to sliding that may occur due to reduced tire-road friction.