Rasel designed a form of communication enabling (a) people to convey

(b) and preserve their thoughts to incorporate

(c ) a series of dots which were read(d) by the finger tips.

Question:

Rasel designed a form of communication enabling (a) people to convey

(b) and preserve their thoughts to incorporate

(c ) a series of dots which were read

(d) by the finger tips.

Correct Answer: 'c'

Explanation:

The question describes a form of communication involving the use of a series of dots that can be read by the fingertips. This description is strongly indicative of Braille, a tactile writing system used by the visually impaired. Braille characters are made up of patterns of raised dots arranged in cells of up to six dots in a 3x2 configuration, allowing users to read through touch.

Analyzing Each Option:

• Option (a): The phrase "enabling people to convey" is grammatically correct and makes sense in the context, but it does not specifically address the requirement to "incorporate a series of dots".

• Option (b): This option, "and preserve their thoughts", implies an action that is necessary for communication but again, does not satisfy the condition around the series of dots.

• Option (c): "To incorporate a series of dots" fits perfectly with the description of Braille. The system is based on a series of raised dots that are specifically arranged to be read by the fingertips. This option precisely captures the unique feature of Braille and makes the sentence complete and contextually accurate.

• Option (d): "Which were read by the fingertips" accurately describes how Braille is read, but without the phrase "to incorporate a series of dots," the sentence would lack a crucial element of clarity and completeness.

Conclusion:

Given the necessity to reference the core component of the communication system designed—namely, the series of dots—the correct answer has to be option (c). This completes the idea presented in the question while accurately defining the nature of the communication system.

For further reading on Braille and its development, you can refer to high-authority sources such as the American Foundation for the Blind or the Perkins School for the Blind.