large waves cause erosion of shorelines. seawalls constructed of concrete can protect shorelines from this erosion

which type of connection is made between the ideas in these sentences?

A. contrast

B. description

C. problem and solution

D. cause and effect

D. cause and effect

The type of connection made between the ideas in these sentences is D. cause and effect.

The type of connection made between the ideas in these sentences is C. problem and solution.

Explanation:
In the given sentences, the problem of erosion of shorelines caused by large waves is presented. The solution to this problem is then described as the construction of seawalls made of concrete to protect the shorelines from erosion. Therefore, the connection between the problem of erosion and the solution of constructing seawalls reflects the problem and solution relationship.