Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following sentences.

There are (A) enough many endangered (B) species in the region (C) that the local authority has decided (D) to create more protected areas.
1. enough
2. species
3. that
4. to
The (A) cost of advertising on (B) the Internet is (C) equally low as (D) that of using printed brochures.
1. cost
2. the
3. equally
4. that
Visitors can safely (A) take photos (B) of wild animals in the park (C) unless they quietly (D) move around the area.
1. take
2. of
3. unless
4. move
My manager (A) has decided (B) to have the company's computer software (C) update (D) at least once a month.
1. has
2. to
3. update
4. at