Choose the correct option for each question. There is only one correct response for each question.
Which of these helps to reduce friction?

Options

A. Oil and grease
B. Grooves and oil
C. Spikes and grease
D. Grease and grooves

Answer

To solve the question of which option helps to reduce friction, we can analyze each option provided:

1. **Oil and Grease**: Both oil and grease are known as lubricants. They are commonly used in various applications to reduce friction between surfaces in contact. Therefore, this option is likely to help reduce friction.

2. **Grooves and Oil**: While oil does help to reduce friction, grooves are designed to increase friction by providing more surface area for contact. Thus, this combination does not effectively reduce friction.

3. **Spikes and Grease**: Grease is a lubricant that reduces friction, but spikes increase friction by creating more contact points. Therefore, this option does not effectively reduce friction.

4. **Grease and Grooves**: Again, while grease reduces friction, grooves increase friction. This combination does not effectively reduce friction.

Based on the analysis of all options, the correct answer is:

**Correct Option: Oil and Grease**

### Step-by-Step Solution:
1. **Identify the Options**: Read through the given options carefully.
2. **Analyze Each Option**: Determine the effect of each component in the options on friction.
- For option 1, recognize that both components are lubricants.
- For option 2, note that grooves increase friction.
- For option 3, understand that spikes increase friction.
- For option 4, acknowledge that grooves increase friction.
3. **Determine the Correct Option**: Conclude that only option 1 (Oil and Grease) effectively reduces friction.