Which quality allows programmers to modify a program as and when required?
a. portability
b. structure
c. generally
d. flexibility

A. Portability

Explanation:

Portability in computer programming is understood as capability of a program to be used in operating environment other than the one in which it was initially constructed.

A portable computer program can be run on different machines, having different operating environment, without making any major changes to program.

Program's portability allows programmer to make modification in programs as per need.

Hence the correct option is A. Portability.

Option B i.e. structure of a program is related to its overall presentation and organization.

Option C and D i..e generally and flexibility have no relevance here and are not used as keywords in context of computer programming.

it can either be 2. or 4. : ) tell me if i'm wrong or right

professionals can use many types of technology that can them. some examples are, computers (they research and can use for programs for data, they are also used for job applications, school work, and even to make new ideas), speedometers (can get data for unknown data), sometimes something as small as a pen (used for rough drafts, to insert data, and again job applications).