Question

read the following excerpt from a student essay. how can the writer best improve his or her grammar and mechanics?
raise the minimum driving age from sixteen? i dont think so. driving a vehicle is important for teens. a life - changing experience. being able to drive teaches teens responsibility and decision - making skills. many teens have jobs or sports practices after school. need to drive themselves to these places. if the driving age were raised, there would be problems for teens. more difficult to get around. fewer chances for responsibility. no to raising the driving age!
by correcting misplaced modifiers
by fixing subject - verb agreement errors
by fixing sentence fragments

Explanation:

The text contains sentence fragments like "Need to drive themselves to these places" and "More difficult to get around". Fixing sentence fragments would improve grammar. There are no issues with misplaced modifiers or subject - verb agreement errors.

Answer:

by fixing sentence fragments