The integral
cannot be evaluated by using a simple substitution.Option (c) is correct.
Further explanation:
Given:
The integrals are as follows,
(a). 
(b). 
(c). 
(d). None of these.
Explanation:
Option (a)
The integral is 
Substitute
for
in integral 

The integral can be obtained as follows,

Option (a) can be evaluated by simple substitution.
Option (b)
The integral is 
The integral can be obtained as follows,

Option (b) can be evaluated by simple substitution.
Option (c)
The integral is 
Substitute
for
in integral 

The integral can be obtained as follows,

Option (c) cannot be evaluated by simple substitution as we have to use integration by parts.
The integral
cannot be evaluated by using a simple substitution.Option (c) is correct.
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Answer details:
Grade: High School
Subject: Mathematics
Chapter: Linear equation
Keywords: integral, evaluated, simple substitution, integration, differentiation, exponential.