The roots hairs are

Explanation

The question is asking about the function of root hairs. Root hairs are tiny, finger-like projections that grow from the surface of a plant's roots. Their main function is to absorb water and minerals from the soil. This is important for the plant's growth and survival. Option A, strength and support, is incorrect because while roots do provide support to the plant, this is not the function of root hairs specifically. Option B, conducting liquid, is incorrect as well. While plants do conduct water and nutrients throughout their structures, root hairs are not involved in this process. Option C is correct. Root hairs absorb water and minerals from the soil, which are then transported throughout the plant. Option D, penetration into the soil, is also incorrect. While roots do penetrate into the soil, this is not the function of root hairs specifically. In summary, the correct answer to the question is option C, absorption of water and salt. Root hairs are important structures that help plants absorb the necessary nutrients for their growth and survival.